21027788 has 12 divisors (see below), whose sum is σ = 36864072. Its totient is φ = 10495200.

The previous prime is 21027767. The next prime is 21027791. The reversal of 21027788 is 88772012.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

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, 1970 + ... + 6777.

It is an arithmetic number, because the mean of its divisors is an integer number (3072006).

Almost surely, 2^21027788 is an apocalyptic number.

It is an amenable number.

21027788 is a deficient number, since it is larger than the sum of its proper divisors (15836284).

21027788 is a wasteful number, since it uses less digits than its factorization.

21027788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9352 (or 9350 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 21027788 is about 4585.6066119980. The cubic root of 21027788 is about 276.0140544548.

The spelling of 21027788 in words is "twenty-one million, twenty-seven thousand, seven hundred eighty-eight".