21715322 has 16 divisors (see below), whose sum is σ = 33628392. Its totient is φ = 10510080.

The previous prime is 21715321. The next prime is 21715327. The reversal of 21715322 is 22351712.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16008001 + 5707321 = 4001^2 + 2389^2 .

It is not an unprimeable number, because it can be changed into a prime (21715321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10268 + ... + 12200.

Almost surely, 2^21715322 is an apocalyptic number.

21715322 is a deficient number, since it is larger than the sum of its proper divisors (11913070).

21715322 is a wasteful number, since it uses less digits than its factorization.

21715322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2113.

The product of its digits is 840, while the sum is 23.

The square root of 21715322 is about 4659.9701715784. The cubic root of 21715322 is about 278.9900777122.

The spelling of 21715322 in words is "twenty-one million, seven hundred fifteen thousand, three hundred twenty-two".