21442496 has 28 divisors (see below), whose sum is σ = 43098720. Its totient is φ = 10583040.

The previous prime is 21442489. The next prime is 21442501. The reversal of 21442496 is 69424412.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2936 + ... + 7176.

It is an arithmetic number, because the mean of its divisors is an integer number (1539240).

Almost surely, 2^21442496 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 21442496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21549360).

21442496 is an abundant number, since it is smaller than the sum of its proper divisors (21656224).

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

21442496 is an equidigital number, since it uses as much as digits as its factorization.

21442496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4332 (or 4322 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 21442496 is about 4630.6042802209. The cubic root of 21442496 is about 277.8167624336.

The spelling of 21442496 in words is "twenty-one million, four hundred forty-two thousand, four hundred ninety-six".