21390064296 has 64 divisors (see below), whose sum is σ = 55369267200. Its totient is φ = 6877920000.

The previous prime is 21390064291. The next prime is 21390064313. The reversal of 21390064296 is 69246009312.

It is not an unprimeable number, because it can be changed into a prime (21390064291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 787746 + ... + 814446.

It is an arithmetic number, because the mean of its divisors is an integer number (865144800).

Almost surely, 2^21390064296 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21390064296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27684633600).

21390064296 is an abundant number, since it is smaller than the sum of its proper divisors (33979202904).

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

21390064296 is a wasteful number, since it uses less digits than its factorization.

21390064296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27890 (or 27886 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 42.

The spelling of 21390064296 in words is "twenty-one billion, three hundred ninety million, sixty-four thousand, two hundred ninety-six".