111211220220021 has 64 divisors (see below), whose sum is σ = 168250431709440. Its totient is φ = 72584075013120.

The previous prime is 111211220220013. The next prime is 111211220220043. The reversal of 111211220220021 is 120022022112111.

111211220220021 is a `hidden beast` number, since 1 + 11 + 211 + 220 + 2 + 200 + 21 = 666.

It is not a de Polignac number, because 111211220220021 - 2³ = 111211220220013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111211220219976 and 111211220220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211220220071) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4336890826 + ... + 4336916468.

It is an arithmetic number, because the mean of its divisors is an integer number (2628912995460).

Almost surely, 2^{111211220220021} is an apocalyptic number.

It is an amenable number.

111211220220021 is a deficient number, since it is larger than the sum of its proper divisors (57039211489419).

111211220220021 is a wasteful number, since it uses less digits than its factorization.

111211220220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41923 (or 41917 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 111211220220021 its reverse (120022022112111), we get a palindrome (231233242332132).

The spelling of 111211220220021 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred twenty million, two hundred twenty thousand, twenty-one".