21363696 has 80 divisors (see below), whose sum is σ = 64951200. Its totient is φ = 6700032.

The previous prime is 21363659. The next prime is 21363703. The reversal of 21363696 is 69636312.

21363696 is a `hidden beast` number, since 2 + 13 + 636 + 9 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a self number, because there is not a number n which added to its sum of digits gives 21363696.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5890 + ... + 8798.

It is an arithmetic number, because the mean of its divisors is an integer number (811890).

Almost surely, 2^21363696 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 21363696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32475600).

21363696 is an abundant number, since it is smaller than the sum of its proper divisors (43587504).

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

21363696 is a wasteful number, since it uses less digits than its factorization.

21363696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2943 (or 2931 counting only the distinct ones).

The product of its digits is 34992, while the sum is 36.

The square root of 21363696 is about 4622.0878399269. The cubic root of 21363696 is about 277.4760242251.

It can be divided in two parts, 2136 and 3696, that added together give a cube (5832 = 18³).

The spelling of 21363696 in words is "twenty-one million, three hundred sixty-three thousand, six hundred ninety-six".