21432474 has 24 divisors (see below), whose sum is σ = 53071200. Its totient is φ = 6123528.

The previous prime is 21432473. The next prime is 21432493. The reversal of 21432474 is 47423412.

It is not an unprimeable number, because it can be changed into a prime (21432473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84924 + ... + 85175.

It is an arithmetic number, because the mean of its divisors is an integer number (2211300).

Almost surely, 2^21432474 is an apocalyptic number.

21432474 is an abundant number, since it is smaller than the sum of its proper divisors (31638726).

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

21432474 is a wasteful number, since it uses less digits than its factorization.

21432474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170114 (or 170111 counting only the distinct ones).

The product of its digits is 5376, while the sum is 27.

The square root of 21432474 is about 4629.5220055639. The cubic root of 21432474 is about 277.7734727985.

Adding to 21432474 its reverse (47423412), we get a palindrome (68855886).

The spelling of 21432474 in words is "twenty-one million, four hundred thirty-two thousand, four hundred seventy-four".