21550072595 has 4 divisors (see below), whose sum is σ = 25860087120. Its totient is φ = 17240058072.

The previous prime is 21550072547. The next prime is 21550072657. The reversal of 21550072595 is 59527005512.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21550072595 - 2¹² = 21550068499 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2155007255 + ... + 2155007264.

It is an arithmetic number, because the mean of its divisors is an integer number (6465021780).

Almost surely, 2^21550072595 is an apocalyptic number.

21550072595 is a deficient number, since it is larger than the sum of its proper divisors (4310014525).

21550072595 is an equidigital number, since it uses as much as digits as its factorization.

21550072595 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4310014524.

The product of its (nonzero) digits is 157500, while the sum is 41.

The spelling of 21550072595 in words is "twenty-one billion, five hundred fifty million, seventy-two thousand, five hundred ninety-five".