10000021131 has 20 divisors (see below), whose sum is σ = 14948760112. Its totient is φ = 6662014128.

The previous prime is 10000021111. The next prime is 10000021139. The reversal of 10000021131 is 13112000001.

It is not a de Polignac number, because 10000021131 - 2⁶ = 10000021067 is a prime.

It is a super-2 number, since 2×10000021131² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10000021139) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 75210 + ... + 160176.

Almost surely, 2^10000021131 is an apocalyptic number.

10000021131 is a deficient number, since it is larger than the sum of its proper divisors (4948738981).

10000021131 is an equidigital number, since it uses as much as digits as its factorization.

10000021131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86432 (or 86423 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 9.

Adding to 10000021131 its reverse (13112000001), we get a palindrome (23112021132).

The spelling of 10000021131 in words is "ten billion, twenty-one thousand, one hundred thirty-one".