21368752763 has 4 divisors (see below), whose sum is σ = 21381557760. Its totient is φ = 21355947768.

The previous prime is 21368752721. The next prime is 21368752789. The reversal of 21368752763 is 36725786312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21368752763 - 2²² = 21364558459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21368752703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6399995 + ... + 6403332.

It is an arithmetic number, because the mean of its divisors is an integer number (5345389440).

Almost surely, 2^21368752763 is an apocalyptic number.

21368752763 is a deficient number, since it is larger than the sum of its proper divisors (12804997).

21368752763 is a wasteful number, since it uses less digits than its factorization.

21368752763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12804996.

The product of its digits is 2540160, while the sum is 50.

The spelling of 21368752763 in words is "twenty-one billion, three hundred sixty-eight million, seven hundred fifty-two thousand, seven hundred sixty-three".