21547934670 has 32 divisors (see below), whose sum is σ = 53498322720. Its totient is φ = 5547973760.

The previous prime is 21547934657. The next prime is 21547934701. The reversal of 21547934670 is 7643974512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12383001 + ... + 12384740.

It is an arithmetic number, because the mean of its divisors is an integer number (1671822585).

Almost surely, 2^21547934670 is an apocalyptic number.

21547934670 is an abundant number, since it is smaller than the sum of its proper divisors (31950388050).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21547934670 is a wasteful number, since it uses less digits than its factorization.

21547934670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24767780.

The product of its (nonzero) digits is 1270080, while the sum is 48.

The spelling of 21547934670 in words is "twenty-one billion, five hundred forty-seven million, nine hundred thirty-four thousand, six hundred seventy".