21400232 has 32 divisors (see below), whose sum is σ = 48273600. Its totient is φ = 8688384.

The previous prime is 21400219. The next prime is 21400271. The reversal of 21400232 is 23200412.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8993 + ... + 11120.

It is an arithmetic number, because the mean of its divisors is an integer number (1508550).

Almost surely, 2^21400232 is an apocalyptic number.

It is an amenable number.

21400232 is an abundant number, since it is smaller than the sum of its proper divisors (26873368).

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

21400232 is a wasteful number, since it uses less digits than its factorization.

21400232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20145 (or 20141 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 21400232 is about 4626.0384780069. The cubic root of 21400232 is about 277.6341131357.

Adding to 21400232 its reverse (23200412), we get a palindrome (44600644).

The spelling of 21400232 in words is "twenty-one million, four hundred thousand, two hundred thirty-two".