21870088 has 16 divisors (see below), whose sum is σ = 41190480. Its totient is φ = 10885968.

The previous prime is 21870053. The next prime is 21870091. The reversal of 21870088 is 88007812.

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, 4206 + ... + 7837.

It is an arithmetic number, because the mean of its divisors is an integer number (2574405).

Almost surely, 2^21870088 is an apocalyptic number.

It is an amenable number.

21870088 is a deficient number, since it is larger than the sum of its proper divisors (19320392).

21870088 is a wasteful number, since it uses less digits than its factorization.

21870088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12276 (or 12272 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 21870088 is about 4676.5465890976. The cubic root of 21870088 is about 279.6513006197.

The spelling of 21870088 in words is "twenty-one million, eight hundred seventy thousand, eighty-eight".