21229680765 has 8 divisors (see below), whose sum is σ = 33967489248. Its totient is φ = 11322496400.

The previous prime is 21229680743. The next prime is 21229680793. The reversal of 21229680765 is 56708692212.

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

It is not a de Polignac number, because 21229680765 - 2⁹ = 21229680253 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 707656011 + ... + 707656040.

It is an arithmetic number, because the mean of its divisors is an integer number (4245936156).

Almost surely, 2^21229680765 is an apocalyptic number.

It is an amenable number.

21229680765 is a deficient number, since it is larger than the sum of its proper divisors (12737808483).

21229680765 is a wasteful number, since it uses less digits than its factorization.

21229680765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415312059.

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 21229680765 in words is "twenty-one billion, two hundred twenty-nine million, six hundred eighty thousand, seven hundred sixty-five".