27699021 has 12 divisors (see below), whose sum is σ = 45725472. Its totient is φ = 15827976.

The previous prime is 27698999. The next prime is 27699043. The reversal of 27699021 is 12099672.

It is an interprime number because it is at equal distance from previous prime (27698999) and next prime (27699043).

It is not a de Polignac number, because 27699021 - 2⁷ = 27698893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27699821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 219771 + ... + 219896.

It is an arithmetic number, because the mean of its divisors is an integer number (3810456).

Almost surely, 2^27699021 is an apocalyptic number.

27699021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

27699021 is a deficient number, since it is larger than the sum of its proper divisors (18026451).

27699021 is a wasteful number, since it uses less digits than its factorization.

27699021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439680 (or 439677 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 27699021 is about 5262.9859395594. The cubic root of 27699021 is about 302.5669400841.

The spelling of 27699021 in words is "twenty-seven million, six hundred ninety-nine thousand, twenty-one".