21031011000013 has 4 divisors (see below), whose sum is σ = 24035441142880. Its totient is φ = 18026580857148.

The previous prime is 21031010999963. The next prime is 21031011000037. The reversal of 21031011000013 is 31000011013012.

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 21031011000013 - 2²⁹ = 21030474129101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21031010999957 and 21031011000002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031011000613) 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, 1502215071423 + ... + 1502215071436.

It is an arithmetic number, because the mean of its divisors is an integer number (6008860285720).

Almost surely, 2^{21031011000013} is an apocalyptic number.

It is an amenable number.

21031011000013 is a deficient number, since it is larger than the sum of its proper divisors (3004430142867).

21031011000013 is an equidigital number, since it uses as much as digits as its factorization.

21031011000013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3004430142866.

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

Adding to 21031011000013 its reverse (31000011013012), we get a palindrome (52031022013025).

The spelling of 21031011000013 in words is "twenty-one trillion, thirty-one billion, eleven million, thirteen", and thus it is an aban number and an uban number.