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1221101113121 = 7971431531847
BaseRepresentation
bin10001110001001111010…
…011000100111100100001
311022201212122011201110122
4101301033103010330201
5130001303341104441
62332544402410025
7154136011130201
oct21611723047441
94281778151418
101221101113121
1143095882075a
121787a8360915
138b1c3142b66
144315cb5c401
1521b6c45c34b
hex11c4f4c4f21

1221101113121 has 4 divisors (see below), whose sum is σ = 1221103442112. Its totient is φ = 1221098784132.

The previous prime is 1221101113087. The next prime is 1221101113123. The reversal of 1221101113121 is 1213111011221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1221101113121 - 210 = 1221101112097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221101113121.

It is not an unprimeable number, because it can be changed into a prime (1221101113123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31220 + ... + 1563066.

It is an arithmetic number, because the mean of its divisors is an integer number (305275860528).

Almost surely, 21221101113121 is an apocalyptic number.

It is an amenable number.

1221101113121 is a deficient number, since it is larger than the sum of its proper divisors (2328991).

1221101113121 is an equidigital number, since it uses as much as digits as its factorization.

1221101113121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2328990.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 1221101113121 its reverse (1213111011221), we get a palindrome (2434212124342).

The spelling of 1221101113121 in words is "one trillion, two hundred twenty-one billion, one hundred one million, one hundred thirteen thousand, one hundred twenty-one".

Divisors: 1 797143 1531847 1221101113121