21032313213 has 4 divisors (see below), whose sum is σ = 28043084288. Its totient is φ = 14021542140.

The previous prime is 21032313157. The next prime is 21032313217. The reversal of 21032313213 is 31231323012.

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 not a de Polignac number, because 21032313213 - 2³³ = 12442378621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21032313213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032313217) 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, 3505385533 + ... + 3505385538.

It is an arithmetic number, because the mean of its divisors is an integer number (7010771072).

Almost surely, 2^21032313213 is an apocalyptic number.

It is an amenable number.

21032313213 is a deficient number, since it is larger than the sum of its proper divisors (7010771075).

21032313213 is an equidigital number, since it uses as much as digits as its factorization.

21032313213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7010771074.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21032313213 its reverse (31231323012), we get a palindrome (52263636225).

The spelling of 21032313213 in words is "twenty-one billion, thirty-two million, three hundred thirteen thousand, two hundred thirteen".