21758904719 has 8 divisors (see below), whose sum is σ = 21896489520. Its totient is φ = 21621370176.

The previous prime is 21758904703. The next prime is 21758904749. The reversal of 21758904719 is 91740985712.

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 21758904719 - 2⁴ = 21758904703 is a prime.

It is a super-2 number, since 2×21758904719² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21758904749) 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, 1255787 + ... + 1272995.

It is an arithmetic number, because the mean of its divisors is an integer number (2737061190).

Almost surely, 2^21758904719 is an apocalyptic number.

21758904719 is a deficient number, since it is larger than the sum of its proper divisors (137584801).

21758904719 is a wasteful number, since it uses less digits than its factorization.

21758904719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25129.

The product of its (nonzero) digits is 1270080, while the sum is 53.

The spelling of 21758904719 in words is "twenty-one billion, seven hundred fifty-eight million, nine hundred four thousand, seven hundred nineteen".