21936285 has 64 divisors (see below), whose sum is σ = 45158400. Its totient is φ = 9896256.

The previous prime is 21936253. The next prime is 21936293. The reversal of 21936285 is 58263912.

21936285 is a `hidden beast` number, since 21 + 9 + 3 + 628 + 5 = 666.

It is not a de Polignac number, because 21936285 - 2⁵ = 21936253 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 131272 + ... + 131438.

It is an arithmetic number, because the mean of its divisors is an integer number (705600).

Almost surely, 2^21936285 is an apocalyptic number.

It is an amenable number.

21936285 is an abundant number, since it is smaller than the sum of its proper divisors (23222115).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21936285 is a wasteful number, since it uses less digits than its factorization.

21936285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 321 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 21936285 is about 4683.6187931983. The cubic root of 21936285 is about 279.9331685735.

The spelling of 21936285 in words is "twenty-one million, nine hundred thirty-six thousand, two hundred eighty-five".