21286022180 has 24 divisors (see below), whose sum is σ = 45544057272. Its totient is φ = 8353759232.

The previous prime is 21286022161. The next prime is 21286022227. The reversal of 21286022180 is 8122068212.

It can be written as a sum of positive squares in 4 ways, for example, as 10203828196 + 11082193984 = 101014^2 + 105272^2 .

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, 10039517 + ... + 10041636.

It is an arithmetic number, because the mean of its divisors is an integer number (1897669053).

Almost surely, 2^21286022180 is an apocalyptic number.

21286022180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21286022180 is an abundant number, since it is smaller than the sum of its proper divisors (24258035092).

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

21286022180 is a wasteful number, since it uses less digits than its factorization.

21286022180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20081215 (or 20081213 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The spelling of 21286022180 in words is "twenty-one billion, two hundred eighty-six million, twenty-two thousand, one hundred eighty".