21177092708 has 12 divisors (see below), whose sum is σ = 37067639532. Its totient is φ = 10586338560.

The previous prime is 21177092701. The next prime is 21177092767. The reversal of 21177092708 is 80729077112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12133463104 + 9043629604 = 110152^2 + 95098^2 .

It is not an unprimeable number, because it can be changed into a prime (21177092701) 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, 530273 + ... + 568808.

It is an arithmetic number, because the mean of its divisors is an integer number (3088969961).

Almost surely, 2^21177092708 is an apocalyptic number.

It is an amenable number.

21177092708 is a deficient number, since it is larger than the sum of its proper divisors (15890546824).

21177092708 is a wasteful number, since it uses less digits than its factorization.

21177092708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103902 (or 1103900 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 44.

The spelling of 21177092708 in words is "twenty-one billion, one hundred seventy-seven million, ninety-two thousand, seven hundred eight".