21632452 has 6 divisors (see below), whose sum is σ = 37856798. Its totient is φ = 10816224.

The previous prime is 21632447. The next prime is 21632459. The reversal of 21632452 is 25423612.

It can be written as a sum of positive squares in only one way, i.e., 12787776 + 8844676 = 3576^2 + 2974^2 .

It is not an unprimeable number, because it can be changed into a prime (21632459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2704053 + ... + 2704060.

Almost surely, 2^21632452 is an apocalyptic number.

It is an amenable number.

21632452 is a deficient number, since it is larger than the sum of its proper divisors (16224346).

21632452 is a wasteful number, since it uses less digits than its factorization.

21632452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5408117 (or 5408115 counting only the distinct ones).

The product of its digits is 2880, while the sum is 25.

The square root of 21632452 is about 4651.0699844229. The cubic root of 21632452 is about 278.6347313764.

The spelling of 21632452 in words is "twenty-one million, six hundred thirty-two thousand, four hundred fifty-two".