21093277 has 16 divisors (see below), whose sum is σ = 23656320. Its totient is φ = 18703872.

The previous prime is 21093253. The next prime is 21093283. The reversal of 21093277 is 77239012.

It is a cyclic number.

It is not a de Polignac number, because 21093277 - 2¹⁵ = 21060509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21093217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28174 + ... + 28912.

It is an arithmetic number, because the mean of its divisors is an integer number (1478520).

Almost surely, 2^21093277 is an apocalyptic number.

It is an amenable number.

21093277 is a deficient number, since it is larger than the sum of its proper divisors (2563043).

21093277 is a wasteful number, since it uses less digits than its factorization.

21093277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 852.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 21093277 is about 4592.7417737121. The cubic root of 21093277 is about 276.3002971418.

The spelling of 21093277 in words is "twenty-one million, ninety-three thousand, two hundred seventy-seven".