21880918084 has 9 divisors (see below), whose sum is σ = 38292124381. Its totient is φ = 10940311120.

The previous prime is 21880918067. The next prime is 21880918091. The reversal of 21880918084 is 48081908812.

The square root of 21880918084 is 147922.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 20028476484 + 1852441600 = 141522^2 + 43040^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 258864 + ... + 332824.

Almost surely, 2^21880918084 is an apocalyptic number.

21880918084 is the 147922-nd square number.

It is an amenable number.

21880918084 is a deficient number, since it is larger than the sum of its proper divisors (16411206297).

21880918084 is an frugal number, since it uses more digits than its factorization.

21880918084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147926 (or 73963 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 49.

Multiplying 21880918084 by its sum of digits (49), we get a square (1072164986116 = 1035454²).

The spelling of 21880918084 in words is "twenty-one billion, eight hundred eighty million, nine hundred eighteen thousand, eighty-four".