21375152 has 20 divisors (see below), whose sum is σ = 43594680. Its totient is φ = 10124928.

The previous prime is 21375143. The next prime is 21375157. The reversal of 21375152 is 25157312.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21375157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34853 + ... + 35460.

It is an arithmetic number, because the mean of its divisors is an integer number (2179734).

Almost surely, 2^21375152 is an apocalyptic number.

It is an amenable number.

21375152 is an abundant number, since it is smaller than the sum of its proper divisors (22219528).

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

21375152 is a wasteful number, since it uses less digits than its factorization.

21375152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70340 (or 70334 counting only the distinct ones).

The product of its digits is 2100, while the sum is 26.

The square root of 21375152 is about 4623.3269406348. The cubic root of 21375152 is about 277.5256129809.

The spelling of 21375152 in words is "twenty-one million, three hundred seventy-five thousand, one hundred fifty-two".