21374263644631 has 2 divisors, whose sum is σ = 21374263644632. Its totient is φ = 21374263644630.

The previous prime is 21374263644557. The next prime is 21374263644641. The reversal of 21374263644631 is 13644636247312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21374263644631 - 2²¹ = 21374261547479 is a prime.

It is a super-2 number, since 2×21374263644631² (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 (21374263644641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10687131822315 + 10687131822316.

It is an arithmetic number, because the mean of its divisors is an integer number (10687131822316).

Almost surely, 2^{21374263644631} is an apocalyptic number.

21374263644631 is a deficient number, since it is larger than the sum of its proper divisors (1).

21374263644631 is an equidigital number, since it uses as much as digits as its factorization.

21374263644631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 52.

The spelling of 21374263644631 in words is "twenty-one trillion, three hundred seventy-four billion, two hundred sixty-three million, six hundred forty-four thousand, six hundred thirty-one".