21064673266631 has 2 divisors, whose sum is σ = 21064673266632. Its totient is φ = 21064673266630.

The previous prime is 21064673266613. The next prime is 21064673266649. The reversal of 21064673266631 is 13666237646012.

Together with previous prime (21064673266613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (21064673266613) and next prime (21064673266649).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21064673266631 is a prime.

It is a super-2 number, since 2×21064673266631² (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 (21064673266661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10532336633315 + 10532336633316.

It is an arithmetic number, because the mean of its divisors is an integer number (10532336633316).

Almost surely, 2^{21064673266631} is an apocalyptic number.

21064673266631 is a deficient number, since it is larger than the sum of its proper divisors (1).

21064673266631 is an equidigital number, since it uses as much as digits as its factorization.

21064673266631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7838208, while the sum is 53.

The spelling of 21064673266631 in words is "twenty-one trillion, sixty-four billion, six hundred seventy-three million, two hundred sixty-six thousand, six hundred thirty-one".