21708244960 has 48 divisors (see below), whose sum is σ = 51903660816. Its totient is φ = 8578674688.

The previous prime is 21708244927. The next prime is 21708244963. The reversal of 21708244960 is 6944280712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21708244963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 804049 + ... + 830608.

It is an arithmetic number, because the mean of its divisors is an integer number (1081326267).

Almost surely, 2^21708244960 is an apocalyptic number.

21708244960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21708244960 is an abundant number, since it is smaller than the sum of its proper divisors (30195415856).

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

21708244960 is a wasteful number, since it uses less digits than its factorization.

21708244960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634755 (or 1634747 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 21708244960 in words is "twenty-one billion, seven hundred eight million, two hundred forty-four thousand, nine hundred sixty".