21432942 has 12 divisors (see below), whose sum is σ = 46438080. Its totient is φ = 7144308.

The previous prime is 21432913. The next prime is 21432949. The reversal of 21432942 is 24923412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432949) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 595342 + ... + 595377.

It is an arithmetic number, because the mean of its divisors is an integer number (3869840).

Almost surely, 2^21432942 is an apocalyptic number.

21432942 is an abundant number, since it is smaller than the sum of its proper divisors (25005138).

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

21432942 is a wasteful number, since it uses less digits than its factorization.

21432942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190727 (or 1190724 counting only the distinct ones).

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

The square root of 21432942 is about 4629.5725504629. The cubic root of 21432942 is about 277.7754946064.

It can be divided in two parts, 2143294 and 2, that added together give a square (2143296 = 1464²).

The spelling of 21432942 in words is "twenty-one million, four hundred thirty-two thousand, nine hundred forty-two".