21177027 has 12 divisors (see below), whose sum is σ = 31300984. Its totient is φ = 13789440.

The previous prime is 21177011. The next prime is 21177029. The reversal of 21177027 is 72077112.

It is not a de Polignac number, because 21177027 - 2⁴ = 21177011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21177029) 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, 26974 + ... + 27747.

Almost surely, 2^21177027 is an apocalyptic number.

21177027 is a deficient number, since it is larger than the sum of its proper divisors (10123957).

21177027 is a wasteful number, since it uses less digits than its factorization.

21177027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54770 (or 54767 counting only the distinct ones).

The product of its (nonzero) digits is 1372, while the sum is 27.

The square root of 21177027 is about 4601.8503887024. The cubic root of 21177027 is about 276.6654939387.

The spelling of 21177027 in words is "twenty-one million, one hundred seventy-seven thousand, twenty-seven".