21441632 has 12 divisors (see below), whose sum is σ = 42213276. Its totient is φ = 10720800.

The previous prime is 21441617. The next prime is 21441661. The reversal of 21441632 is 23614412.

It is a junction number, because it is equal to n+sod(n) for n = 21441598 and 21441607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334994 + ... + 335057.

It is an arithmetic number, because the mean of its divisors is an integer number (3517773).

Almost surely, 2^21441632 is an apocalyptic number.

It is an amenable number.

21441632 is a deficient number, since it is larger than the sum of its proper divisors (20771644).

21441632 is an equidigital number, since it uses as much as digits as its factorization.

21441632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670061 (or 670053 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 21441632 is about 4630.5109869214. The cubic root of 21441632 is about 277.8130309510.

The spelling of 21441632 in words is "twenty-one million, four hundred forty-one thousand, six hundred thirty-two".