13131210021 has 4 divisors (see below), whose sum is σ = 17508280032. Its totient is φ = 8754140012.

The previous prime is 13131210019. The next prime is 13131210031. The reversal of 13131210021 is 12001213131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13131210021 - 2¹ = 13131210019 is a prime.

It is a super-2 number, since 2×13131210021² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13131210031) 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, 2188535001 + ... + 2188535006.

It is an arithmetic number, because the mean of its divisors is an integer number (4377070008).

Almost surely, 2^13131210021 is an apocalyptic number.

It is an amenable number.

13131210021 is a deficient number, since it is larger than the sum of its proper divisors (4377070011).

13131210021 is an equidigital number, since it uses as much as digits as its factorization.

13131210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4377070010.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 13131210021 its reverse (12001213131), we get a palindrome (25132423152).

The spelling of 13131210021 in words is "thirteen billion, one hundred thirty-one million, two hundred ten thousand, twenty-one".