21463372 has 18 divisors (see below), whose sum is σ = 43693692. Its totient is φ = 9198504.

The previous prime is 21463363. The next prime is 21463373. The reversal of 21463372 is 27336412.

It is a super-2 number, since 2×21463372² = 921352675220768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 21463372.

It is not an unprimeable number, because it can be changed into a prime (21463373) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54558 + ... + 54949.

Almost surely, 2^21463372 is an apocalyptic number.

It is an amenable number.

21463372 is an abundant number, since it is smaller than the sum of its proper divisors (22230320).

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

21463372 is a wasteful number, since it uses less digits than its factorization.

21463372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109525 (or 109516 counting only the distinct ones).

The product of its digits is 6048, while the sum is 28.

The square root of 21463372 is about 4632.8578652922. The cubic root of 21463372 is about 277.9068922020.

Adding to 21463372 its reverse (27336412), we get a palindrome (48799784).

The spelling of 21463372 in words is "twenty-one million, four hundred sixty-three thousand, three hundred seventy-two".