21312122002013 has 4 divisors (see below), whose sum is σ = 21355884060000. Its totient is φ = 21268359944028.

The previous prime is 21312122002009. The next prime is 21312122002049. The reversal of 21312122002013 is 31020022121312.

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 21312122002013 - 2² = 21312122002009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312122002313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21881028263 + ... + 21881029236.

It is an arithmetic number, because the mean of its divisors is an integer number (5338971015000).

Almost surely, 2^{21312122002013} is an apocalyptic number.

It is an amenable number.

21312122002013 is a deficient number, since it is larger than the sum of its proper divisors (43762057987).

21312122002013 is an equidigital number, since it uses as much as digits as its factorization.

21312122002013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43762057986.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21312122002013 its reverse (31020022121312), we get a palindrome (52332144123325).

The spelling of 21312122002013 in words is "twenty-one trillion, three hundred twelve billion, one hundred twenty-two million, two thousand, thirteen".