21303672 has 32 divisors (see below), whose sum is σ = 57356880. Its totient is φ = 6554880.

The previous prime is 21303671. The next prime is 21303673. The reversal of 21303672 is 27630312.

It is an interprime number because it is at equal distance from previous prime (21303671) and next prime (21303673).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33829 + ... + 34452.

Almost surely, 2^21303672 is an apocalyptic number.

It is an amenable number.

21303672 is an abundant number, since it is smaller than the sum of its proper divisors (36053208).

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

21303672 is a wasteful number, since it uses less digits than its factorization.

21303672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68303 (or 68299 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 21303672 is about 4615.5901031179. The cubic root of 21303672 is about 277.2159124981.

Adding to 21303672 its reverse (27630312), we get a palindrome (48933984).

The spelling of 21303672 in words is "twenty-one million, three hundred three thousand, six hundred seventy-two".