21870325178 has 16 divisors (see below), whose sum is σ = 35331932160. Its totient is φ = 10093154736.

The previous prime is 21870325151. The next prime is 21870325187. The reversal of 21870325178 is 87152307812.

It is a super-2 number, since 2×21870325178² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371951 + ... + 426717.

It is an arithmetic number, because the mean of its divisors is an integer number (2208245760).

Almost surely, 2^21870325178 is an apocalyptic number.

21870325178 is a deficient number, since it is larger than the sum of its proper divisors (13461606982).

21870325178 is a wasteful number, since it uses less digits than its factorization.

21870325178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70141.

The product of its (nonzero) digits is 188160, while the sum is 44.

The spelling of 21870325178 in words is "twenty-one billion, eight hundred seventy million, three hundred twenty-five thousand, one hundred seventy-eight".