21002220012131 has 4 divisors (see below), whose sum is σ = 21003047189664. Its totient is φ = 21001392834600.

The previous prime is 21002220012119. The next prime is 21002220012143. The reversal of 21002220012131 is 13121002220012.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21002220012119) and next prime (21002220012143).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21002220012131 is a prime.

It is a super-2 number, since 2×21002220012131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002220012101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413550680 + ... + 413601461.

It is an arithmetic number, because the mean of its divisors is an integer number (5250761797416).

Almost surely, 2^{21002220012131} is an apocalyptic number.

21002220012131 is a deficient number, since it is larger than the sum of its proper divisors (827177533).

21002220012131 is an equidigital number, since it uses as much as digits as its factorization.

21002220012131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827177532.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21002220012131 its reverse (13121002220012), we get a palindrome (34123222232143).

The spelling of 21002220012131 in words is "twenty-one trillion, two billion, two hundred twenty million, twelve thousand, one hundred thirty-one".