21000320032313 has 8 divisors (see below), whose sum is σ = 21325408689000. Its totient is φ = 20676242539008.

The previous prime is 21000320032217. The next prime is 21000320032333. The reversal of 21000320032313 is 31323002300012.

It can be written as a sum of positive squares in 4 ways, for example, as 814376295184 + 20185943737129 = 902428^2 + 4492877^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21000320032313 - 2²² = 21000315838009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000320032333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252748988 + ... + 252832061.

It is an arithmetic number, because the mean of its divisors is an integer number (2665676086125).

Almost surely, 2^{21000320032313} is an apocalyptic number.

It is an amenable number.

21000320032313 is a deficient number, since it is larger than the sum of its proper divisors (325088656687).

21000320032313 is an equidigital number, since it uses as much as digits as its factorization.

21000320032313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505581691.

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

Adding to 21000320032313 its reverse (31323002300012), we get a palindrome (52323322332325).

The spelling of 21000320032313 in words is "twenty-one trillion, three hundred twenty million, thirty-two thousand, three hundred thirteen".