21297316096 has 81 divisors (see below), whose sum is σ = 49490064351. Its totient is φ = 9120416256.

The previous prime is 21297316093. The next prime is 21297316097. The reversal of 21297316096 is 69061379212.

It is a happy number.

The square root of 21297316096 is 145936.

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

It is not an unprimeable number, because it can be changed into a prime (21297316091) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 16344181 + ... + 16345483.

Almost surely, 2^21297316096 is an apocalyptic number.

21297316096 is the 145936-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21297316096

21297316096 is an abundant number, since it is smaller than the sum of its proper divisors (28192748255).

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

21297316096 is an frugal number, since it uses more digits than its factorization.

21297316096 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2636 (or 1312 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 46.

The spelling of 21297316096 in words is "twenty-one billion, two hundred ninety-seven million, three hundred sixteen thousand, ninety-six".