21176140905 has 16 divisors (see below), whose sum is σ = 37646472960. Its totient is φ = 11293941744.

The previous prime is 21176140873. The next prime is 21176140919. The reversal of 21176140905 is 50904167112.

21176140905 is a `hidden beast` number, since 21 + 17 + 614 + 0 + 9 + 0 + 5 = 666.

It is not a de Polignac number, because 21176140905 - 2⁵ = 21176140873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21176140905.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78430017 + ... + 78430286.

It is an arithmetic number, because the mean of its divisors is an integer number (2352904560).

Almost surely, 2^21176140905 is an apocalyptic number.

It is an amenable number.

21176140905 is a deficient number, since it is larger than the sum of its proper divisors (16470332055).

21176140905 is a wasteful number, since it uses less digits than its factorization.

21176140905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156860317 (or 156860311 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The spelling of 21176140905 in words is "twenty-one billion, one hundred seventy-six million, one hundred forty thousand, nine hundred five".