21363372 has 96 divisors (see below), whose sum is σ = 60480000. Its totient is φ = 6495552.

The previous prime is 21363367. The next prime is 21363383. The reversal of 21363372 is 27336312.

21363372 is a `hidden beast` number, since 21 + 3 + 633 + 7 + 2 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59329 + ... + 59687.

It is an arithmetic number, because the mean of its divisors is an integer number (630000).

Almost surely, 2^21363372 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 21363372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30240000).

21363372 is an abundant number, since it is smaller than the sum of its proper divisors (39116628).

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

21363372 is a wasteful number, since it uses less digits than its factorization.

21363372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420 (or 412 counting only the distinct ones).

The product of its digits is 4536, while the sum is 27.

The square root of 21363372 is about 4622.0527906981. The cubic root of 21363372 is about 277.4746214921.

Adding to 21363372 its reverse (27336312), we get a palindrome (48699684).

The spelling of 21363372 in words is "twenty-one million, three hundred sixty-three thousand, three hundred seventy-two".