21908680522 has 8 divisors (see below), whose sum is σ = 32865475716. Its totient is φ = 10953521952.

The previous prime is 21908680513. The next prime is 21908680523. The reversal of 21908680522 is 22508680912.

It can be written as a sum of positive squares in 2 ways, for example, as 21644000161 + 264680361 = 147119^2 + 16269^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21908680523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375123 + ... + 429574.

Almost surely, 2^21908680522 is an apocalyptic number.

21908680522 is a deficient number, since it is larger than the sum of its proper divisors (10956795194).

21908680522 is a wasteful number, since it uses less digits than its factorization.

21908680522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818312.

The product of its (nonzero) digits is 138240, while the sum is 43.

The spelling of 21908680522 in words is "twenty-one billion, nine hundred eight million, six hundred eighty thousand, five hundred twenty-two".