12221211210021 has 96 divisors (see below), whose sum is σ = 20281711177728. Its totient is φ = 7291665152640.

The previous prime is 12221211210011. The next prime is 12221211210023. The reversal of 12221211210021 is 12001211212221.

12221211210021 is a `hidden beast` number, since 1 + 2 + 221 + 211 + 210 + 0 + 21 = 666.

It is not a de Polignac number, because 12221211210021 - 2²¹ = 12221209112869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12221211209976 and 12221211210003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221211210023) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 296733196 + ... + 296774378.

It is an arithmetic number, because the mean of its divisors is an integer number (211267824768).

Almost surely, 2^{12221211210021} is an apocalyptic number.

12221211210021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221211210021 is a deficient number, since it is larger than the sum of its proper divisors (8060499967707).

12221211210021 is a wasteful number, since it uses less digits than its factorization.

12221211210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42933 (or 42921 counting only the distinct ones).

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

Adding to 12221211210021 its reverse (12001211212221), we get a palindrome (24222422422242).

The spelling of 12221211210021 in words is "twelve trillion, two hundred twenty-one billion, two hundred eleven million, two hundred ten thousand, twenty-one".