12221111100021 has 16 divisors (see below), whose sum is σ = 16681074231360. Its totient is φ = 7954443826560.

The previous prime is 12221111099959. The next prime is 12221111100043. The reversal of 12221111100021 is 12000111112221.

It is a happy number.

It is not a de Polignac number, because 12221111100021 - 2²⁷ = 12220976882293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221111100061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20472366 + ... + 21060863.

It is an arithmetic number, because the mean of its divisors is an integer number (1042567139460).

Almost surely, 2^{12221111100021} is an apocalyptic number.

It is an amenable number.

12221111100021 is a deficient number, since it is larger than the sum of its proper divisors (4459963131339).

12221111100021 is a wasteful number, since it uses less digits than its factorization.

12221111100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41535556.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 12221111100021 its reverse (12000111112221), we get a palindrome (24221222212242).

The spelling of 12221111100021 in words is "twelve trillion, two hundred twenty-one billion, one hundred eleven million, one hundred thousand, twenty-one".