21632442 has 32 divisors (see below), whose sum is σ = 46811520. Its totient is φ = 6624960.

The previous prime is 21632417. The next prime is 21632447. The reversal of 21632442 is 24423612.

It is not an unprimeable number, because it can be changed into a prime (21632447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20467 + ... + 21497.

It is an arithmetic number, because the mean of its divisors is an integer number (1462860).

Almost surely, 2^21632442 is an apocalyptic number.

21632442 is an abundant number, since it is smaller than the sum of its proper divisors (25179078).

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

21632442 is a wasteful number, since it uses less digits than its factorization.

21632442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318.

The product of its digits is 2304, while the sum is 24.

The square root of 21632442 is about 4651.0689094014. The cubic root of 21632442 is about 278.6346884417.

The spelling of 21632442 in words is "twenty-one million, six hundred thirty-two thousand, four hundred forty-two".