21201213000013 has 4 divisors (see below), whose sum is σ = 21499821633888. Its totient is φ = 20902604366140.

The previous prime is 21201212999999. The next prime is 21201213000043. The reversal of 21201213000013 is 31000031210212.

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 a de Polignac number, because none of the positive numbers 2^k-21201213000013 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 (21201213000043) 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, 149304316831 + ... + 149304316972.

It is an arithmetic number, because the mean of its divisors is an integer number (5374955408472).

Almost surely, 2^{21201213000013} is an apocalyptic number.

It is an amenable number.

21201213000013 is a deficient number, since it is larger than the sum of its proper divisors (298608633875).

21201213000013 is an equidigital number, since it uses as much as digits as its factorization.

21201213000013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298608633874.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21201213000013 its reverse (31000031210212), we get a palindrome (52201244210225).

The spelling of 21201213000013 in words is "twenty-one trillion, two hundred one billion, two hundred thirteen million, thirteen", and thus it is an aban number.