21838578884 has 12 divisors (see below), whose sum is σ = 38218865664. Its totient is φ = 10918902984.

The previous prime is 21838578869. The next prime is 21838578893. The reversal of 21838578884 is 48887583812.

It is a super-3 number, since 3×21838578884³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58037 + ... + 216899.

It is an arithmetic number, because the mean of its divisors is an integer number (3184905472).

Almost surely, 2^21838578884 is an apocalyptic number.

It is an amenable number.

21838578884 is a deficient number, since it is larger than the sum of its proper divisors (16380286780).

21838578884 is a wasteful number, since it uses less digits than its factorization.

21838578884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193234 (or 193232 counting only the distinct ones).

The product of its digits is 27525120, while the sum is 62.

The spelling of 21838578884 in words is "twenty-one billion, eight hundred thirty-eight million, five hundred seventy-eight thousand, eight hundred eighty-four".