21314772 has 24 divisors (see below), whose sum is σ = 55260800. Its totient is φ = 7104888.

The previous prime is 21314771. The next prime is 21314773. The reversal of 21314772 is 27741312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21314771) and next prime (21314773).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21314771) 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, 98572 + ... + 98787.

Almost surely, 2^21314772 is an apocalyptic number.

It is an amenable number.

21314772 is an abundant number, since it is smaller than the sum of its proper divisors (33946028).

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

21314772 is a wasteful number, since it uses less digits than its factorization.

21314772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197372 (or 197364 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 21314772 is about 4616.7923929932. The cubic root of 21314772 is about 277.2640507151.

It can be divided in two parts, 2131 and 4772, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 21314772 in words is "twenty-one million, three hundred fourteen thousand, seven hundred seventy-two".