21703645331 has 2 divisors, whose sum is σ = 21703645332. Its totient is φ = 21703645330.

The previous prime is 21703645283. The next prime is 21703645339. The reversal of 21703645331 is 13354630712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21703645331 - 2⁶ = 21703645267 is a prime.

It is a super-2 number, since 2×21703645331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21703645291 and 21703645300.

It is not a weakly prime, because it can be changed into another prime (21703645339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10851822665 + 10851822666.

It is an arithmetic number, because the mean of its divisors is an integer number (10851822666).

Almost surely, 2^21703645331 is an apocalyptic number.

21703645331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21703645331 is an equidigital number, since it uses as much as digits as its factorization.

21703645331 is an evil number, because the sum of its binary digits is even.

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

The spelling of 21703645331 in words is "twenty-one billion, seven hundred three million, six hundred forty-five thousand, three hundred thirty-one".