111224851921 has 16 divisors (see below), whose sum is σ = 117133993728. Its totient is φ = 105408160000.

The previous prime is 111224851897. The next prime is 111224851937. The reversal of 111224851921 is 129158422111.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111224851921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111224851951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1607796 + ... + 1675546.

It is an arithmetic number, because the mean of its divisors is an integer number (7320874608).

Almost surely, 2^111224851921 is an apocalyptic number.

It is an amenable number.

111224851921 is a deficient number, since it is larger than the sum of its proper divisors (5909141807).

111224851921 is a wasteful number, since it uses less digits than its factorization.

111224851921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68432.

The product of its digits is 11520, while the sum is 37.

The spelling of 111224851921 in words is "one hundred eleven billion, two hundred twenty-four million, eight hundred fifty-one thousand, nine hundred twenty-one".