21002220313 has 4 divisors (see below), whose sum is σ = 21082076928. Its totient is φ = 20922363700.

The previous prime is 21002220293. The next prime is 21002220319. The reversal of 21002220313 is 31302220012.

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-21002220313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002220319) 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, 39927913 + ... + 39928438.

It is an arithmetic number, because the mean of its divisors is an integer number (5270519232).

Almost surely, 2^21002220313 is an apocalyptic number.

It is an amenable number.

21002220313 is a deficient number, since it is larger than the sum of its proper divisors (79856615).

21002220313 is an equidigital number, since it uses as much as digits as its factorization.

21002220313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79856614.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21002220313 its reverse (31302220012), we get a palindrome (52304440325).

The spelling of 21002220313 in words is "twenty-one billion, two million, two hundred twenty thousand, three hundred thirteen".