21492496 has 45 divisors (see below), whose sum is σ = 44681013. Its totient is φ = 10013760.

The previous prime is 21492479. The next prime is 21492533. The reversal of 21492496 is 69429412.

It is a happy number.

The square root of 21492496 is 4636.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 698896 + 20793600 = 836^2 + 4560^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 352306 + ... + 352366.

Almost surely, 2^21492496 is an apocalyptic number.

21492496 is the 4636-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21492496

21492496 is an abundant number, since it is smaller than the sum of its proper divisors (23188517).

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

21492496 is an equidigital number, since it uses as much as digits as its factorization.

21492496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 82 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The cubic root of 21492496 is about 278.0325341908.

The spelling of 21492496 in words is "twenty-one million, four hundred ninety-two thousand, four hundred ninety-six".