221022111210021 has 48 divisors (see below), whose sum is σ = 368766447940800. Its totient is φ = 126072437736960.

The previous prime is 221022111210011. The next prime is 221022111210023. The reversal of 221022111210021 is 120012111220122.

221022111210021 is a `hidden beast` number, since 2 + 210 + 221 + 1 + 1 + 210 + 0 + 21 = 666.

It is not a de Polignac number, because 221022111210021 - 2⁶ = 221022111209957 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221022111209976 and 221022111210003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221022111210023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 373581186 + ... + 374172348.

It is an arithmetic number, because the mean of its divisors is an integer number (7682634332100).

Almost surely, 2^{221022111210021} is an apocalyptic number.

It is an amenable number.

221022111210021 is a deficient number, since it is larger than the sum of its proper divisors (147744336730779).

221022111210021 is a wasteful number, since it uses less digits than its factorization.

221022111210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813346 (or 813343 counting only the distinct ones).

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

Adding to 221022111210021 its reverse (120012111220122), we get a palindrome (341034222430143).

The spelling of 221022111210021 in words is "two hundred twenty-one trillion, twenty-two billion, one hundred eleven million, two hundred ten thousand, twenty-one".