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1222111111121 = 7117212832551
BaseRepresentation
bin10001110010001011011…
…111111010011111010001
311022211111000122221020222
4101302023133322133101
5130010340421023441
62333232522242425
7154203024021605
oct21621337723721
94284430587228
101222111111121
1143132695314a
12178a2a656415
138b324470a04
1443216d4d505
1521bcae65d4b
hex11c8b7fa7d1

1222111111121 has 4 divisors (see below), whose sum is σ = 1239323943744. Its totient is φ = 1204898278500.

The previous prime is 1222111111103. The next prime is 1222111111127. The reversal of 1222111111121 is 1211111112221.

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 a de Polignac number, because none of the positive numbers 2k-1222111111121 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 1222111111121.

It is not an unprimeable number, because it can be changed into a prime (1222111111127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8606416205 + ... + 8606416346.

It is an arithmetic number, because the mean of its divisors is an integer number (309830985936).

Almost surely, 21222111111121 is an apocalyptic number.

It is an amenable number.

1222111111121 is a deficient number, since it is larger than the sum of its proper divisors (17212832623).

1222111111121 is an equidigital number, since it uses as much as digits as its factorization.

1222111111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17212832622.

The product of its digits is 16, while the sum is 17.

Adding to 1222111111121 its reverse (1211111112221), we get a palindrome (2433222223342).

The spelling of 1222111111121 in words is "one trillion, two hundred twenty-two billion, one hundred eleven million, one hundred eleven thousand, one hundred twenty-one".

Divisors: 1 71 17212832551 1222111111121