21375087 has 8 divisors (see below), whose sum is σ = 28527360. Its totient is φ = 14236440.

The previous prime is 21375061. The next prime is 21375097. The reversal of 21375087 is 78057312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21375087 - 2⁶ = 21375023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21375007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1114 + ... + 6632.

It is an arithmetic number, because the mean of its divisors is an integer number (3565920).

Almost surely, 2^21375087 is an apocalyptic number.

21375087 is a deficient number, since it is larger than the sum of its proper divisors (7152273).

21375087 is a wasteful number, since it uses less digits than its factorization.

21375087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6813.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 21375087 is about 4623.3199110596. The cubic root of 21375087 is about 277.5253316702.

The spelling of 21375087 in words is "twenty-one million, three hundred seventy-five thousand, eighty-seven".