21180958358 has 64 divisors (see below), whose sum is σ = 39333465600. Its totient is φ = 8350490880.

The previous prime is 21180958307. The next prime is 21180958397. The reversal of 21180958358 is 85385908112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5617898 + ... + 5621666.

It is an arithmetic number, because the mean of its divisors is an integer number (614585400).

Almost surely, 2^21180958358 is an apocalyptic number.

21180958358 is a deficient number, since it is larger than the sum of its proper divisors (18152507242).

21180958358 is a wasteful number, since it uses less digits than its factorization.

21180958358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4405.

The product of its (nonzero) digits is 691200, while the sum is 50.

The spelling of 21180958358 in words is "twenty-one billion, one hundred eighty million, nine hundred fifty-eight thousand, three hundred fifty-eight".