21432294 has 24 divisors (see below), whose sum is σ = 50009232. Its totient is φ = 6594480.

The previous prime is 21432293. The next prime is 21432311. The reversal of 21432294 is 49223412.

It is a super-2 number, since 2×21432294² = 918686452204872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45562 + ... + 46029.

It is an arithmetic number, because the mean of its divisors is an integer number (2083718).

Almost surely, 2^21432294 is an apocalyptic number.

21432294 is an abundant number, since it is smaller than the sum of its proper divisors (28576938).

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

21432294 is a wasteful number, since it uses less digits than its factorization.

21432294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91612 (or 91609 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 21432294 is about 4629.5025650711. The cubic root of 21432294 is about 277.7726951722.

The spelling of 21432294 in words is "twenty-one million, four hundred thirty-two thousand, two hundred ninety-four".