21764720117 has 8 divisors (see below), whose sum is σ = 25955442816. Its totient is φ = 17844366672.

The previous prime is 21764720009. The next prime is 21764720129. The reversal of 21764720117 is 71102746712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21764720117 - 2³² = 17469752821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21764720137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67592138 + ... + 67592459.

It is an arithmetic number, because the mean of its divisors is an integer number (3244430352).

Almost surely, 2^21764720117 is an apocalyptic number.

It is an amenable number.

21764720117 is a deficient number, since it is larger than the sum of its proper divisors (4190722699).

21764720117 is a wasteful number, since it uses less digits than its factorization.

21764720117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135184627.

The product of its (nonzero) digits is 32928, while the sum is 38.

The spelling of 21764720117 in words is "twenty-one billion, seven hundred sixty-four million, seven hundred twenty thousand, one hundred seventeen".