21088075 has 36 divisors (see below), whose sum is σ = 29161080. Its totient is φ = 15070720.

The previous prime is 21088069. The next prime is 21088087. The reversal of 21088075 is 57088012.

It is not a de Polignac number, because 21088075 - 2¹¹ = 21086027 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 357396 + ... + 357454.

It is an arithmetic number, because the mean of its divisors is an integer number (810030).

Almost surely, 2^21088075 is an apocalyptic number.

21088075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21088075 is a deficient number, since it is larger than the sum of its proper divisors (8073005).

21088075 is a wasteful number, since it uses less digits than its factorization.

21088075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 21088075 is about 4592.1754104128. The cubic root of 21088075 is about 276.2775816526.

The spelling of 21088075 in words is "twenty-one million, eighty-eight thousand, seventy-five".