21703645313 has 6 divisors (see below), whose sum is σ = 25247097666. Its totient is φ = 18603124512.

The previous prime is 21703645283. The next prime is 21703645331. The reversal of 21703645313 is 31354630712.

It can be written as a sum of positive squares in only one way, i.e., 12794550769 + 8909094544 = 113113^2 + 94388^2 .

It is not a de Polignac number, because 21703645313 - 2²⁰ = 21702596737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21703645363) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 221465720 + ... + 221465817.

It is an arithmetic number, because the mean of its divisors is an integer number (4207849611).

Almost surely, 2^21703645313 is an apocalyptic number.

It is an amenable number.

21703645313 is a deficient number, since it is larger than the sum of its proper divisors (3543452353).

21703645313 is an equidigital number, since it uses as much as digits as its factorization.

21703645313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442931551 (or 442931544 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 35.

The spelling of 21703645313 in words is "twenty-one billion, seven hundred three million, six hundred forty-five thousand, three hundred thirteen".