12221220120021 has 80 divisors (see below), whose sum is σ = 20606861246400. Its totient is φ = 7149991564800.

The previous prime is 12221220119981. The next prime is 12221220120023. The reversal of 12221220120021 is 12002102212221.

It is a happy number.

12221220120021 is a `hidden beast` number, since 1 + 2 + 221 + 220 + 1 + 200 + 21 = 666.

It is not a de Polignac number, because 12221220120021 - 2⁶ = 12221220119957 is a prime.

It is a super-2 number, since 2×12221220120021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12221220119976 and 12221220120003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221220120023) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 139977901 + ... + 140065181.

It is an arithmetic number, because the mean of its divisors is an integer number (257585765580).

Almost surely, 2^{12221220120021} is an apocalyptic number.

12221220120021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221220120021 is a deficient number, since it is larger than the sum of its proper divisors (8385641126379).

12221220120021 is a wasteful number, since it uses less digits than its factorization.

12221220120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92752 (or 92743 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12221220120021 its reverse (12002102212221), we get a palindrome (24223322332242).

The spelling of 12221220120021 in words is "twelve trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twenty thousand, twenty-one".