21049507296178 has 32 divisors (see below), whose sum is σ = 33547637341440. Its totient is φ = 9877352602320.

The previous prime is 21049507296173. The next prime is 21049507296187. The reversal of 21049507296178 is 87169270594012.

It is not an unprimeable number, because it can be changed into a prime (21049507296173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234038725 + ... + 234128647.

It is an arithmetic number, because the mean of its divisors is an integer number (1048363666920).

Almost surely, 2^{21049507296178} is an apocalyptic number.

21049507296178 is a deficient number, since it is larger than the sum of its proper divisors (12498130045262).

21049507296178 is a wasteful number, since it uses less digits than its factorization.

21049507296178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147622.

The product of its (nonzero) digits is 15240960, while the sum is 61.

The spelling of 21049507296178 in words is "twenty-one trillion, forty-nine billion, five hundred seven million, two hundred ninety-six thousand, one hundred seventy-eight".