21684562270 has 64 divisors (see below), whose sum is σ = 45809971200. Its totient is φ = 7237077120.

The previous prime is 21684562223. The next prime is 21684562271. The reversal of 21684562270 is 7226548612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21684562271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 365016 + ... + 420244.

It is an arithmetic number, because the mean of its divisors is an integer number (715780800).

Almost surely, 2^21684562270 is an apocalyptic number.

21684562270 is an abundant number, since it is smaller than the sum of its proper divisors (24125408930).

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

21684562270 is a wasteful number, since it uses less digits than its factorization.

21684562270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55393.

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 21684562270 in words is "twenty-one billion, six hundred eighty-four million, five hundred sixty-two thousand, two hundred seventy".