21702486329 has 8 divisors (see below), whose sum is σ = 22086134280. Its totient is φ = 21321945216.

The previous prime is 21702486301. The next prime is 21702486341. The reversal of 21702486329 is 92368420712.

It can be written as a sum of positive squares in 4 ways, for example, as 3773276329 + 17929210000 = 61427^2 + 133900^2 .

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 21702486329 - 2²⁸ = 21434050873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21702486329.

It is not an unprimeable number, because it can be changed into a prime (21702486359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 762614 + ... + 790559.

It is an arithmetic number, because the mean of its divisors is an integer number (2760766785).

Almost surely, 2^21702486329 is an apocalyptic number.

It is an amenable number.

21702486329 is a deficient number, since it is larger than the sum of its proper divisors (383647951).

21702486329 is a wasteful number, since it uses less digits than its factorization.

21702486329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553419.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 21702486329 in words is "twenty-one billion, seven hundred two million, four hundred eighty-six thousand, three hundred twenty-nine".