21996732 has 48 divisors (see below), whose sum is σ = 54835200. Its totient is φ = 6847680.

The previous prime is 21996731. The next prime is 21996757. The reversal of 21996732 is 23769912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21996731) 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, 9769 + ... + 11807.

It is an arithmetic number, because the mean of its divisors is an integer number (1142400).

Almost surely, 2^21996732 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21996732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27417600).

21996732 is an abundant number, since it is smaller than the sum of its proper divisors (32838468).

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

21996732 is a wasteful number, since it uses less digits than its factorization.

21996732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106 (or 2104 counting only the distinct ones).

The product of its digits is 40824, while the sum is 39.

The square root of 21996732 is about 4690.0673769147. The cubic root of 21996732 is about 280.1900580383.

The spelling of 21996732 in words is "twenty-one million, nine hundred ninety-six thousand, seven hundred thirty-two".