12221111220021 has 24 divisors (see below), whose sum is σ = 19259054470656. Its totient is φ = 7406139503040.

The previous prime is 12221111220001. The next prime is 12221111220037. The reversal of 12221111220021 is 12002211112221.

12221111220021 is a `hidden beast` number, since 122 + 211 + 112 + 200 + 21 = 666.

It is not a de Polignac number, because 12221111220021 - 2⁶ = 12221111219957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12221111219976 and 12221111220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221111220001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3713685 + ... + 6183338.

It is an arithmetic number, because the mean of its divisors is an integer number (802460602944).

Almost surely, 2^{12221111220021} is an apocalyptic number.

12221111220021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221111220021 is a deficient number, since it is larger than the sum of its proper divisors (7037943250635).

12221111220021 is a wasteful number, since it uses less digits than its factorization.

12221111220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9909513 (or 9909510 counting only the distinct ones).

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

Adding to 12221111220021 its reverse (12002211112221), we get a palindrome (24223322332242).

It can be divided in two parts, 122211112200 and 21, that added together give a palindrome (122211112221).

The spelling of 12221111220021 in words is "twelve trillion, two hundred twenty-one billion, one hundred eleven million, two hundred twenty thousand, twenty-one".