21938072 has 16 divisors (see below), whose sum is σ = 44298240. Its totient is φ = 10125216.

The previous prime is 21938057. The next prime is 21938083. The reversal of 21938072 is 27083912.

It is a congruent number.

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, 105368 + ... + 105575.

It is an arithmetic number, because the mean of its divisors is an integer number (2768640).

Almost surely, 2^21938072 is an apocalyptic number.

It is an amenable number.

21938072 is an abundant number, since it is smaller than the sum of its proper divisors (22360168).

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

21938072 is a wasteful number, since it uses less digits than its factorization.

21938072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210962 (or 210958 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 21938072 is about 4683.8095606034. The cubic root of 21938072 is about 279.9407697845.

The spelling of 21938072 in words is "twenty-one million, nine hundred thirty-eight thousand, seventy-two".