21715338 has 16 divisors (see below), whose sum is σ = 43575840. Its totient is φ = 7214256.

The previous prime is 21715333. The next prime is 21715339. The reversal of 21715338 is 83351712.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21715333) 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, 4053 + ... + 7736.

It is an arithmetic number, because the mean of its divisors is an integer number (2723490).

Almost surely, 2^21715338 is an apocalyptic number.

21715338 is an abundant number, since it is smaller than the sum of its proper divisors (21860502).

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

21715338 is a wasteful number, since it uses less digits than its factorization.

21715338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12101.

The product of its digits is 5040, while the sum is 30.

The square root of 21715338 is about 4659.9718883272. The cubic root of 21715338 is about 278.9901462328.

The spelling of 21715338 in words is "twenty-one million, seven hundred fifteen thousand, three hundred thirty-eight".