21023320313 has 16 divisors (see below), whose sum is σ = 22422500352. Its totient is φ = 19680024000.

The previous prime is 21023320259. The next prime is 21023320369. The reversal of 21023320313 is 31302332012.

It is a cyclic number.

It is not a de Polignac number, because 21023320313 - 2⁸ = 21023320057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21023320613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26543 + ... + 206763.

It is an arithmetic number, because the mean of its divisors is an integer number (1401406272).

Almost surely, 2^21023320313 is an apocalyptic number.

It is an amenable number.

21023320313 is a deficient number, since it is larger than the sum of its proper divisors (1399180039).

21023320313 is a wasteful number, since it uses less digits than its factorization.

21023320313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180376.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21023320313 its reverse (31302332012), we get a palindrome (52325652325).

The spelling of 21023320313 in words is "twenty-one billion, twenty-three million, three hundred twenty thousand, three hundred thirteen".