21824070637 has 4 divisors (see below), whose sum is σ = 23107839516. Its totient is φ = 20540301760.

The previous prime is 21824070613. The next prime is 21824070641. The reversal of 21824070637 is 73607042812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10284799396 + 11539271241 = 101414^2 + 107421^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21824070637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21824070637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21824070937) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 641884414 + ... + 641884447.

It is an arithmetic number, because the mean of its divisors is an integer number (5776959879).

Almost surely, 2^21824070637 is an apocalyptic number.

It is an amenable number.

21824070637 is a deficient number, since it is larger than the sum of its proper divisors (1283768879).

21824070637 is a wasteful number, since it uses less digits than its factorization.

21824070637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283768878.

The product of its (nonzero) digits is 112896, while the sum is 40.

The spelling of 21824070637 in words is "twenty-one billion, eight hundred twenty-four million, seventy thousand, six hundred thirty-seven".