21093177 has 48 divisors (see below), whose sum is σ = 34670592. Its totient is φ = 11360160.

The previous prime is 21093169. The next prime is 21093199. The reversal of 21093177 is 77139012.

It is not a de Polignac number, because 21093177 - 2³ = 21093169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21093157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 297052 + ... + 297122.

It is an arithmetic number, because the mean of its divisors is an integer number (722304).

Almost surely, 2^21093177 is an apocalyptic number.

It is an amenable number.

21093177 is a deficient number, since it is larger than the sum of its proper divisors (13577415).

21093177 is a wasteful number, since it uses less digits than its factorization.

21093177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 2646, while the sum is 30.

The square root of 21093177 is about 4592.7308869560. The cubic root of 21093177 is about 276.2998605087.

The spelling of 21093177 in words is "twenty-one million, ninety-three thousand, one hundred seventy-seven".