21632772415 has 4 divisors (see below), whose sum is σ = 25959326904. Its totient is φ = 17306217928.

The previous prime is 21632772397. The next prime is 21632772463. The reversal of 21632772415 is 51427723612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21632772415 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 2163277237 + ... + 2163277246.

It is an arithmetic number, because the mean of its divisors is an integer number (6489831726).

Almost surely, 2^21632772415 is an apocalyptic number.

21632772415 is a deficient number, since it is larger than the sum of its proper divisors (4326554489).

21632772415 is an equidigital number, since it uses as much as digits as its factorization.

21632772415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4326554488.

The product of its digits is 141120, while the sum is 40.

The spelling of 21632772415 in words is "twenty-one billion, six hundred thirty-two million, seven hundred seventy-two thousand, four hundred fifteen".