21767742368 has 12 divisors (see below), whose sum is σ = 42855242850. Its totient is φ = 10883871168.

The previous prime is 21767742349. The next prime is 21767742377. The reversal of 21767742368 is 86324776712.

It can be written as a sum of positive squares in only one way, i.e., 21699646864 + 68095504 = 147308^2 + 8252^2 .

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340120943 + ... + 340121006.

Almost surely, 2^21767742368 is an apocalyptic number.

It is an amenable number.

21767742368 is a deficient number, since it is larger than the sum of its proper divisors (21087500482).

21767742368 is an equidigital number, since it uses as much as digits as its factorization.

21767742368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680241959 (or 680241951 counting only the distinct ones).

The product of its digits is 4741632, while the sum is 53.

The spelling of 21767742368 in words is "twenty-one billion, seven hundred sixty-seven million, seven hundred forty-two thousand, three hundred sixty-eight".