21230432 has 24 divisors (see below), whose sum is σ = 41904576. Its totient is φ = 10588032.

The previous prime is 21230431. The next prime is 21230459. The reversal of 21230432 is 23403212.

It is a self number, because there is not a number n which added to its sum of digits gives 21230432.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18878 + ... + 19970.

It is an arithmetic number, because the mean of its divisors is an integer number (1746024).

Almost surely, 2^21230432 is an apocalyptic number.

It is an amenable number.

21230432 is a deficient number, since it is larger than the sum of its proper divisors (20674144).

21230432 is a wasteful number, since it uses less digits than its factorization.

21230432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1710 (or 1702 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21230432 is about 4607.6492922096. The cubic root of 21230432 is about 276.8978670941.

Adding to 21230432 its reverse (23403212), we get a palindrome (44633644).

The spelling of 21230432 in words is "twenty-one million, two hundred thirty thousand, four hundred thirty-two".