12221122011021 has 72 divisors (see below), whose sum is σ = 22741458547392. Its totient is φ = 6143839804800.

The previous prime is 12221122011017. The next prime is 12221122011061. The reversal of 12221122011021 is 12011022112221.

12221122011021 is a `hidden beast` number, since 122 + 211 + 220 + 110 + 2 + 1 = 666.

It is not a de Polignac number, because 12221122011021 - 2² = 12221122011017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12221122010985 and 12221122011003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221122011061) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8509416 + ... + 9841361.

It is an arithmetic number, because the mean of its divisors is an integer number (315853590936).

Almost surely, 2^{12221122011021} is an apocalyptic number.

12221122011021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12221122011021 is a deficient number, since it is larger than the sum of its proper divisors (10520336536371).

12221122011021 is a wasteful number, since it uses less digits than its factorization.

12221122011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18350863 (or 18350829 counting only the distinct ones).

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

Adding to 12221122011021 its reverse (12011022112221), we get a palindrome (24232144123242).

The spelling of 12221122011021 in words is "twelve trillion, two hundred twenty-one billion, one hundred twenty-two million, eleven thousand, twenty-one".