21425132 has 6 divisors (see below), whose sum is σ = 37493988. Its totient is φ = 10712564.

The previous prime is 21425099. The next prime is 21425147. The reversal of 21425132 is 23152412.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2678138 + ... + 2678145.

It is an arithmetic number, because the mean of its divisors is an integer number (6248998).

Almost surely, 2^21425132 is an apocalyptic number.

It is an amenable number.

21425132 is a deficient number, since it is larger than the sum of its proper divisors (16068856).

21425132 is a wasteful number, since it uses less digits than its factorization.

21425132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5356287 (or 5356285 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 21425132 is about 4628.7289832091. The cubic root of 21425132 is about 277.7417507528.

Adding to 21425132 its reverse (23152412), we get a palindrome (44577544).

The spelling of 21425132 in words is "twenty-one million, four hundred twenty-five thousand, one hundred thirty-two".