21768708352 has 36 divisors (see below), whose sum is σ = 46008414396. Its totient is φ = 10244096000.

The previous prime is 21768708347. The next prime is 21768708361. The reversal of 21768708352 is 25380786712.

It can be written as a sum of positive squares in 2 ways, for example, as 12540416256 + 9228292096 = 111984^2 + 96064^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21768708296 and 21768708305.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2496649 + ... + 2505352.

It is an arithmetic number, because the mean of its divisors is an integer number (1278011511).

Almost surely, 2^21768708352 is an apocalyptic number.

It is an amenable number.

21768708352 is an abundant number, since it is smaller than the sum of its proper divisors (24239706044).

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

21768708352 is an equidigital number, since it uses as much as digits as its factorization.

21768708352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5002034 (or 5002020 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 49.

The spelling of 21768708352 in words is "twenty-one billion, seven hundred sixty-eight million, seven hundred eight thousand, three hundred fifty-two".