21310020220323 has 4 divisors (see below), whose sum is σ = 28413360293768. Its totient is φ = 14206680146880.

The previous prime is 21310020220309. The next prime is 21310020220331. The reversal of 21310020220323 is 32302202001312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21310020220323 - 2¹⁷ = 21310020089251 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 21310020220323.

It is not an unprimeable number, because it can be changed into a prime (21310020220303) 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, 3551670036718 + ... + 3551670036723.

It is an arithmetic number, because the mean of its divisors is an integer number (7103340073442).

Almost surely, 2^{21310020220323} is an apocalyptic number.

21310020220323 is a deficient number, since it is larger than the sum of its proper divisors (7103340073445).

21310020220323 is an equidigital number, since it uses as much as digits as its factorization.

21310020220323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7103340073444.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21310020220323 its reverse (32302202001312), we get a palindrome (53612222221635).

The spelling of 21310020220323 in words is "twenty-one trillion, three hundred ten billion, twenty million, two hundred twenty thousand, three hundred twenty-three".