21717143329 has 24 divisors (see below), whose sum is σ = 26009403840. Its totient is φ = 17761595808.

The previous prime is 21717143281. The next prime is 21717143401. The reversal of 21717143329 is 92334171712.

It is not a de Polignac number, because 21717143329 - 2²⁹ = 21180272417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21717143291 and 21717143300.

It is not an unprimeable number, because it can be changed into a prime (21717144329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1544559 + ... + 1558555.

It is an arithmetic number, because the mean of its divisors is an integer number (1083725160).

Almost surely, 2^21717143329 is an apocalyptic number.

It is an amenable number.

21717143329 is a deficient number, since it is larger than the sum of its proper divisors (4292260511).

21717143329 is a wasteful number, since it uses less digits than its factorization.

21717143329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14469 (or 14446 counting only the distinct ones).

The product of its digits is 63504, while the sum is 40.

The spelling of 21717143329 in words is "twenty-one billion, seven hundred seventeen million, one hundred forty-three thousand, three hundred twenty-nine".