21445767437631 has 16 divisors (see below), whose sum is σ = 29526717342720. Its totient is φ = 13831309229760.

The previous prime is 21445767437603. The next prime is 21445767437641. The reversal of 21445767437631 is 13673476754412.

It is not a de Polignac number, because 21445767437631 - 2⁷ = 21445767437503 is a prime.

It is a super-2 number, since 2×21445767437631² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21445767437641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38637646 + ... + 39188763.

It is an arithmetic number, because the mean of its divisors is an integer number (1845419833920).

Almost surely, 2^{21445767437631} is an apocalyptic number.

21445767437631 is a deficient number, since it is larger than the sum of its proper divisors (8080949905089).

21445767437631 is a wasteful number, since it uses less digits than its factorization.

21445767437631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77829406.

The product of its digits is 71124480, while the sum is 60.

The spelling of 21445767437631 in words is "twenty-one trillion, four hundred forty-five billion, seven hundred sixty-seven million, four hundred thirty-seven thousand, six hundred thirty-one".