20021002100131 has 4 divisors (see below), whose sum is σ = 20021047413264. Its totient is φ = 20020956787000.

The previous prime is 20021002100111. The next prime is 20021002100167. The reversal of 20021002100131 is 13100120012002.

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

It is a cyclic number.

It is not a de Polignac number, because 20021002100131 - 2³⁹ = 19471246286243 is a prime.

It is a super-2 number, since 2×20021002100131² (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 (20021002100111) 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, 21987220 + ... + 22879681.

It is an arithmetic number, because the mean of its divisors is an integer number (5005261853316).

Almost surely, 2^{20021002100131} is an apocalyptic number.

20021002100131 is a deficient number, since it is larger than the sum of its proper divisors (45313133).

20021002100131 is an equidigital number, since it uses as much as digits as its factorization.

20021002100131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45313132.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20021002100131 its reverse (13100120012002), we get a palindrome (33121122112133).

The spelling of 20021002100131 in words is "twenty trillion, twenty-one billion, two million, one hundred thousand, one hundred thirty-one".