21320981264353 has 8 divisors (see below), whose sum is σ = 21489666387968. Its totient is φ = 21152308693824.

The previous prime is 21320981264329. The next prime is 21320981264371. The reversal of 21320981264353 is 35346218902312.

It is a happy number.

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 21320981264353 - 2²⁵ = 21320947709921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21320981264297 and 21320981264306.

It is not an unprimeable number, because it can be changed into a prime (21320981214353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286825 + ... + 6536377.

It is an arithmetic number, because the mean of its divisors is an integer number (2686208298496).

Almost surely, 2^{21320981264353} is an apocalyptic number.

It is an amenable number.

21320981264353 is a deficient number, since it is larger than the sum of its proper divisors (168685123615).

21320981264353 is a wasteful number, since it uses less digits than its factorization.

21320981264353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6276543.

The product of its (nonzero) digits is 1866240, while the sum is 49.

The spelling of 21320981264353 in words is "twenty-one trillion, three hundred twenty billion, nine hundred eighty-one million, two hundred sixty-four thousand, three hundred fifty-three".