21946032 has 80 divisors (see below), whose sum is σ = 64742880. Its totient is φ = 7112448.

The previous prime is 21946019. The next prime is 21946033. The reversal of 21946032 is 23064912.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21945987 and 21946005.

It is not an unprimeable number, because it can be changed into a prime (21946033) 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, 15298 + ... + 16670.

It is an arithmetic number, because the mean of its divisors is an integer number (809286).

Almost surely, 2^21946032 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 21946032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32371440).

21946032 is an abundant number, since it is smaller than the sum of its proper divisors (42796848).

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

21946032 is a wasteful number, since it uses less digits than its factorization.

21946032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427 (or 1415 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 21946032 is about 4684.6592191962. The cubic root of 21946032 is about 279.9746235505.

The spelling of 21946032 in words is "twenty-one million, nine hundred forty-six thousand, thirty-two".