21213120031313 has 4 divisors (see below), whose sum is σ = 24243565750080. Its totient is φ = 18182674312548.

The previous prime is 21213120031237. The next prime is 21213120031321. The reversal of 21213120031313 is 31313002131212.

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 21213120031313 - 2⁸ = 21213120031057 is a prime.

It is a super-2 number, since 2×21213120031313² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21213120037313) 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, 1515222859373 + ... + 1515222859386.

It is an arithmetic number, because the mean of its divisors is an integer number (6060891437520).

Almost surely, 2^{21213120031313} is an apocalyptic number.

It is an amenable number.

21213120031313 is a deficient number, since it is larger than the sum of its proper divisors (3030445718767).

21213120031313 is an equidigital number, since it uses as much as digits as its factorization.

21213120031313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030445718766.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21213120031313 its reverse (31313002131212), we get a palindrome (52526122162525).

The spelling of 21213120031313 in words is "twenty-one trillion, two hundred thirteen billion, one hundred twenty million, thirty-one thousand, three hundred thirteen".