21936312 has 64 divisors (see below), whose sum is σ = 62445600. Its totient is φ = 7130880.

The previous prime is 21936293. The next prime is 21936323. The reversal of 21936312 is 21363912.

21936312 is a `hidden beast` number, since 21 + 9 + 3 + 631 + 2 = 666.

It is a super-2 number, since 2×21936312² = 962403568322688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7618 + ... + 10094.

Almost surely, 2^21936312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21936312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31222800).

21936312 is an abundant number, since it is smaller than the sum of its proper divisors (40509288).

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

21936312 is a wasteful number, since it uses less digits than its factorization.

21936312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533 (or 2523 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 21936312 is about 4683.6216755840. The cubic root of 21936312 is about 279.9332834242.

The spelling of 21936312 in words is "twenty-one million, nine hundred thirty-six thousand, three hundred twelve".