21010131013 has 4 divisors (see below), whose sum is σ = 21101878540. Its totient is φ = 20918383488.

The previous prime is 21010130993. The next prime is 21010131031. The reversal of 21010131013 is 31013101012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11519084929 + 9491046084 = 107327^2 + 97422^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010131013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21010130984 and 21010131002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010131073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45873420 + ... + 45873877.

It is an arithmetic number, because the mean of its divisors is an integer number (5275469635).

Almost surely, 2^21010131013 is an apocalyptic number.

It is an amenable number.

21010131013 is a deficient number, since it is larger than the sum of its proper divisors (91747527).

21010131013 is an equidigital number, since it uses as much as digits as its factorization.

21010131013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91747526.

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 21010131013 its reverse (31013101012), we get a palindrome (52023232025).

The spelling of 21010131013 in words is "twenty-one billion, ten million, one hundred thirty-one thousand, thirteen".