21939376 has 20 divisors (see below), whose sum is σ = 44745400. Its totient is φ = 10392192.

The previous prime is 21939361. The next prime is 21939383. The reversal of 21939376 is 67393912.

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 3 ways as a sum of consecutive naturals, for example, 35781 + ... + 36388.

It is an arithmetic number, because the mean of its divisors is an integer number (2237270).

Almost surely, 2^21939376 is an apocalyptic number.

It is an amenable number.

21939376 is an abundant number, since it is smaller than the sum of its proper divisors (22806024).

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

21939376 is a wasteful number, since it uses less digits than its factorization.

21939376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72196 (or 72190 counting only the distinct ones).

The product of its digits is 61236, while the sum is 40.

The square root of 21939376 is about 4683.9487614619. The cubic root of 21939376 is about 279.9463162386.

The spelling of 21939376 in words is "twenty-one million, nine hundred thirty-nine thousand, three hundred seventy-six".