21720246350 has 48 divisors (see below), whose sum is σ = 46664865936. Its totient is φ = 7433664000.

The previous prime is 21720246343. The next prime is 21720246389. The reversal of 21720246350 is 5364202712.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1152161 + ... + 1170860.

It is an arithmetic number, because the mean of its divisors is an integer number (972184707).

Almost surely, 2^21720246350 is an apocalyptic number.

21720246350 is an abundant number, since it is smaller than the sum of its proper divisors (24944619586).

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

21720246350 is a wasteful number, since it uses less digits than its factorization.

21720246350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2323061 (or 2323056 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The spelling of 21720246350 in words is "twenty-one billion, seven hundred twenty million, two hundred forty-six thousand, three hundred fifty".