21002100020131 has 8 divisors (see below), whose sum is σ = 22239721548144. Its totient is φ = 19764723367680.

The previous prime is 21002100020089. The next prime is 21002100020147. The reversal of 21002100020131 is 13102000120012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21002100020131 - 2⁹ = 21002100019619 is a prime.

It is a super-2 number, since 2×21002100020131² (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 (21002100020171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61042290 + ... + 61385383.

It is an arithmetic number, because the mean of its divisors is an integer number (2779965193518).

Almost surely, 2^{21002100020131} is an apocalyptic number.

21002100020131 is a deficient number, since it is larger than the sum of its proper divisors (1237621528013).

21002100020131 is a wasteful number, since it uses less digits than its factorization.

21002100020131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122437781.

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

Adding to 21002100020131 its reverse (13102000120012), we get a palindrome (34104100140143).

The spelling of 21002100020131 in words is "twenty-one trillion, two billion, one hundred million, twenty thousand, one hundred thirty-one".