21301312122213 has 4 divisors (see below), whose sum is σ = 28401749496288. Its totient is φ = 14200874748140.

The previous prime is 21301312122161. The next prime is 21301312122229. The reversal of 21301312122213 is 31222121310312.

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 21301312122213 - 2⁹ = 21301312121701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301312122913) 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, 3550218687033 + ... + 3550218687038.

It is an arithmetic number, because the mean of its divisors is an integer number (7100437374072).

Almost surely, 2^{21301312122213} is an apocalyptic number.

It is an amenable number.

21301312122213 is a deficient number, since it is larger than the sum of its proper divisors (7100437374075).

21301312122213 is an equidigital number, since it uses as much as digits as its factorization.

21301312122213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7100437374074.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 21301312122213 its reverse (31222121310312), we get a palindrome (52523433432525).

The spelling of 21301312122213 in words is "twenty-one trillion, three hundred one billion, three hundred twelve million, one hundred twenty-two thousand, two hundred thirteen".