21550031715 has 16 divisors (see below), whose sum is σ = 34482234528. Its totient is φ = 11492622336.

The previous prime is 21550031687. The next prime is 21550031719. The reversal of 21550031715 is 51713005512.

It is not a de Polignac number, because 21550031715 - 2⁶ = 21550031651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21550031719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269667 + ... + 340323.

It is an arithmetic number, because the mean of its divisors is an integer number (2155139658).

Almost surely, 2^21550031715 is an apocalyptic number.

21550031715 is a deficient number, since it is larger than the sum of its proper divisors (12932202813).

21550031715 is a wasteful number, since it uses less digits than its factorization.

21550031715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90998.

The product of its (nonzero) digits is 5250, while the sum is 30.

The spelling of 21550031715 in words is "twenty-one billion, five hundred fifty million, thirty-one thousand, seven hundred fifteen".