21765506502704 has 20 divisors (see below), whose sum is σ = 42171320929680. Its totient is φ = 10882584972480.

The previous prime is 21765506502703. The next prime is 21765506502781. The reversal of 21765506502704 is 40720560556712.

It is a super-3 number, since 3×21765506502704³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21765506502703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9447059 + ... + 11522930.

It is an arithmetic number, because the mean of its divisors is an integer number (2108566046484).

Almost surely, 2^{21765506502704} is an apocalyptic number.

It is an amenable number.

21765506502704 is a deficient number, since it is larger than the sum of its proper divisors (20405814426976).

21765506502704 is a wasteful number, since it uses less digits than its factorization.

21765506502704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21034868 (or 21034862 counting only the distinct ones).

The product of its (nonzero) digits is 3528000, while the sum is 50.

The spelling of 21765506502704 in words is "twenty-one trillion, seven hundred sixty-five billion, five hundred six million, five hundred two thousand, seven hundred four".