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1221131020111 = 2236673820609
BaseRepresentation
bin10001110001010001000…
…101001010011101001111
311022201221201110011010221
4101301101011022131033
5130001334020120421
62332551351412211
7154136523260452
oct21612105123517
94281851404127
101221131020111
11430973698282
121787b6384067
138b1c93b46c2
1443162b05499
1521b6edb8841
hex11c5114a74f

1221131020111 has 8 divisors (see below), whose sum is σ = 1226792255360. Its totient is φ = 1215471439872.

The previous prime is 1221131020069. The next prime is 1221131020157. The reversal of 1221131020111 is 1110201311221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1221131020111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221131020181) 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 7 ways as a sum of consecutive naturals, for example, 1077775 + ... + 1898383.

It is an arithmetic number, because the mean of its divisors is an integer number (153349031920).

Almost surely, 21221131020111 is an apocalyptic number.

1221131020111 is a deficient number, since it is larger than the sum of its proper divisors (5661235249).

1221131020111 is an equidigital number, since it uses as much as digits as its factorization.

1221131020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827505.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 1221131020111 its reverse (1110201311221), we get a palindrome (2331332331332).

The spelling of 1221131020111 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-one million, twenty thousand, one hundred eleven".

Divisors: 1 223 6673 820609 1488079 182995807 5475923857 1221131020111