21772941915 has 32 divisors (see below), whose sum is σ = 35980849152. Its totient is φ = 11231280000.

The previous prime is 21772941877. The next prime is 21772941919. The reversal of 21772941915 is 51914927712.

It is not a de Polignac number, because 21772941915 - 2⁶ = 21772941851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21772941919) 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 31 ways as a sum of consecutive naturals, for example, 871650 + ... + 896280.

It is an arithmetic number, because the mean of its divisors is an integer number (1124401536).

Almost surely, 2^21772941915 is an apocalyptic number.

21772941915 is a deficient number, since it is larger than the sum of its proper divisors (14207907237).

21772941915 is a wasteful number, since it uses less digits than its factorization.

21772941915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26571.

The product of its digits is 317520, while the sum is 48.

The spelling of 21772941915 in words is "twenty-one billion, seven hundred seventy-two million, nine hundred forty-one thousand, nine hundred fifteen".