111921287628 has 24 divisors (see below), whose sum is σ = 261156641200. Its totient is φ = 37306100160.

The previous prime is 111921287537. The next prime is 111921287641. The reversal of 111921287628 is 826782129111.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 449898 + ... + 652878.

Almost surely, 2^111921287628 is an apocalyptic number.

It is an amenable number.

111921287628 is an abundant number, since it is smaller than the sum of its proper divisors (149235353572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111921287628 is a wasteful number, since it uses less digits than its factorization.

111921287628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248937 (or 248935 counting only the distinct ones).

The product of its digits is 193536, while the sum is 48.

The spelling of 111921287628 in words is "one hundred eleven billion, nine hundred twenty-one million, two hundred eighty-seven thousand, six hundred twenty-eight".