21317340224 has 28 divisors (see below), whose sum is σ = 42309603468. Its totient is φ = 10656652800.

The previous prime is 21317340223. The next prime is 21317340227. The reversal of 21317340224 is 42204371312.

It can be written as a sum of positive squares in 2 ways, for example, as 20243598400 + 1073741824 = 142280^2 + 32768^2 .

It is not an unprimeable number, because it can be changed into a prime (21317340223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343934 + ... + 401154.

Almost surely, 2^21317340224 is an apocalyptic number.

It is an amenable number.

21317340224 is a deficient number, since it is larger than the sum of its proper divisors (20992263244).

21317340224 is an equidigital number, since it uses as much as digits as its factorization.

21317340224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63054 (or 63044 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The spelling of 21317340224 in words is "twenty-one billion, three hundred seventeen million, three hundred forty thousand, two hundred twenty-four".