21703576231 has 2 divisors, whose sum is σ = 21703576232. Its totient is φ = 21703576230.

The previous prime is 21703576207. The next prime is 21703576277. The reversal of 21703576231 is 13267530712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21703576231 - 2¹¹ = 21703574183 is a prime.

It is a super-2 number, since 2×21703576231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21703576331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10851788115 + 10851788116.

It is an arithmetic number, because the mean of its divisors is an integer number (10851788116).

Almost surely, 2^21703576231 is an apocalyptic number.

21703576231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21703576231 is an equidigital number, since it uses as much as digits as its factorization.

21703576231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52920, while the sum is 37.

The spelling of 21703576231 in words is "twenty-one billion, seven hundred three million, five hundred seventy-six thousand, two hundred thirty-one".