21709311753 has 8 divisors (see below), whose sum is σ = 29943878400. Its totient is φ = 13973809808.

The previous prime is 21709311683. The next prime is 21709311779. The reversal of 21709311753 is 35711390712.

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 21709311753 - 2²⁰ = 21708263177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21709311053) 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 7 ways as a sum of consecutive naturals, for example, 124766073 + ... + 124766246.

It is an arithmetic number, because the mean of its divisors is an integer number (3742984800).

Almost surely, 2^21709311753 is an apocalyptic number.

It is an amenable number.

21709311753 is a deficient number, since it is larger than the sum of its proper divisors (8234566647).

21709311753 is a wasteful number, since it uses less digits than its factorization.

21709311753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249532351.

The product of its (nonzero) digits is 39690, while the sum is 39.

The spelling of 21709311753 in words is "twenty-one billion, seven hundred nine million, three hundred eleven thousand, seven hundred fifty-three".