111813241572021 has 64 divisors (see below), whose sum is σ = 173133417600000. Its totient is φ = 63473053754880.

The previous prime is 111813241571953. The next prime is 111813241572031. The reversal of 111813241572021 is 120275142318111.

It is not a de Polignac number, because 111813241572021 - 2²⁹ = 111812704701109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111813241572031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 861700855 + ... + 861830603.

It is an arithmetic number, because the mean of its divisors is an integer number (2705209650000).

Almost surely, 2^{111813241572021} is an apocalyptic number.

111813241572021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111813241572021 is a deficient number, since it is larger than the sum of its proper divisors (61320176027979).

111813241572021 is a wasteful number, since it uses less digits than its factorization.

111813241572021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145314.

The product of its (nonzero) digits is 26880, while the sum is 39.

The spelling of 111813241572021 in words is "one hundred eleven trillion, eight hundred thirteen billion, two hundred forty-one million, five hundred seventy-two thousand, twenty-one".