21013000013 has 4 divisors (see below), whose sum is σ = 21018365760. Its totient is φ = 21007634268.

The previous prime is 21013000009. The next prime is 21013000033. The reversal of 21013000013 is 31000031012.

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 21013000013 - 2² = 21013000009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21012999958 and 21013000003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013000033) 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, 2676995 + ... + 2684832.

It is an arithmetic number, because the mean of its divisors is an integer number (5254591440).

Almost surely, 2^21013000013 is an apocalyptic number.

It is an amenable number.

21013000013 is a deficient number, since it is larger than the sum of its proper divisors (5365747).

21013000013 is an equidigital number, since it uses as much as digits as its factorization.

21013000013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5365746.

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 21013000013 its reverse (31000031012), we get a palindrome (52013031025).

The spelling of 21013000013 in words is "twenty-one billion, thirteen million, thirteen", and thus it is an aban number and an uban number.