21717673353 has 24 divisors (see below), whose sum is σ = 32315025600. Its totient is φ = 14046792480.

The previous prime is 21717673343. The next prime is 21717673361. The reversal of 21717673353 is 35337671712.

21717673353 is a `hidden beast` number, since 217 + 17 + 6 + 73 + 353 = 666.

It is not a de Polignac number, because 21717673353 - 2⁴ = 21717673337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21717673299 and 21717673308.

It is not an unprimeable number, because it can be changed into a prime (21717673343) 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 23 ways as a sum of consecutive naturals, for example, 130653 + ... + 245978.

It is an arithmetic number, because the mean of its divisors is an integer number (1346459400).

Almost surely, 2^21717673353 is an apocalyptic number.

It is an amenable number.

21717673353 is a deficient number, since it is larger than the sum of its proper divisors (10597352247).

21717673353 is a wasteful number, since it uses less digits than its factorization.

21717673353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376829 (or 376826 counting only the distinct ones).

The product of its digits is 555660, while the sum is 45.

The spelling of 21717673353 in words is "twenty-one billion, seven hundred seventeen million, six hundred seventy-three thousand, three hundred fifty-three".