111792821 has 16 divisors (see below), whose sum is σ = 130598400. Its totient is φ = 93719808.

The previous prime is 111792817. The next prime is 111792829. The reversal of 111792821 is 128297111.

It is not a de Polignac number, because 111792821 - 2² = 111792817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111792829) 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, 61595 + ... + 63383.

It is an arithmetic number, because the mean of its divisors is an integer number (8162400).

Almost surely, 2^111792821 is an apocalyptic number.

It is an amenable number.

111792821 is a deficient number, since it is larger than the sum of its proper divisors (18805579).

111792821 is a wasteful number, since it uses less digits than its factorization.

111792821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1988.

The product of its digits is 2016, while the sum is 32.

The square root of 111792821 is about 10573.2124257484. The cubic root of 111792821 is about 481.7310486264.

The spelling of 111792821 in words is "one hundred eleven million, seven hundred ninety-two thousand, eight hundred twenty-one".