21708289092 has 72 divisors (see below), whose sum is σ = 60515059584. Its totient is φ = 6034730688.

The previous prime is 21708289081. The next prime is 21708289093. The reversal of 21708289092 is 29098280712.

It is not an unprimeable number, because it can be changed into a prime (21708289093) 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, 477148 + ... + 520659.

Almost surely, 2^21708289092 is an apocalyptic number.

It is an amenable number.

21708289092 is an abundant number, since it is smaller than the sum of its proper divisors (38806770492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21708289092 is a wasteful number, since it uses less digits than its factorization.

21708289092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997865 (or 997856 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 21708289092 in words is "twenty-one billion, seven hundred eight million, two hundred eighty-nine thousand, ninety-two".