21768465308 has 6 divisors (see below), whose sum is σ = 38094814296. Its totient is φ = 10884232652.

The previous prime is 21768465239. The next prime is 21768465311. The reversal of 21768465308 is 80356486712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2721058160 + ... + 2721058167.

It is an arithmetic number, because the mean of its divisors is an integer number (6349135716).

Almost surely, 2^21768465308 is an apocalyptic number.

It is an amenable number.

21768465308 is a deficient number, since it is larger than the sum of its proper divisors (16326348988).

21768465308 is a wasteful number, since it uses less digits than its factorization.

21768465308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5442116331 (or 5442116329 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 21768465308 in words is "twenty-one billion, seven hundred sixty-eight million, four hundred sixty-five thousand, three hundred eight".