21574646579231 has 2 divisors, whose sum is σ = 21574646579232. Its totient is φ = 21574646579230.

The previous prime is 21574646579173. The next prime is 21574646579263. The reversal of 21574646579231 is 13297564647512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21574646579231 is a prime.

It is a super-2 number, since 2×21574646579231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21574640579231) 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 as a sum of consecutive naturals, namely, 10787323289615 + 10787323289616.

It is an arithmetic number, because the mean of its divisors is an integer number (10787323289616).

Almost surely, 2^{21574646579231} is an apocalyptic number.

21574646579231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21574646579231 is an equidigital number, since it uses as much as digits as its factorization.

21574646579231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 76204800, while the sum is 62.

The spelling of 21574646579231 in words is "twenty-one trillion, five hundred seventy-four billion, six hundred forty-six million, five hundred seventy-nine thousand, two hundred thirty-one".