21681696332 has 24 divisors (see below), whose sum is σ = 38308833360. Its totient is φ = 10736375360.

The previous prime is 21681696313. The next prime is 21681696359. The reversal of 21681696332 is 23369618612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2246894 + ... + 2256522.

It is an arithmetic number, because the mean of its divisors is an integer number (1596201390).

Almost surely, 2^21681696332 is an apocalyptic number.

It is an amenable number.

21681696332 is a deficient number, since it is larger than the sum of its proper divisors (16627137028).

21681696332 is a wasteful number, since it uses less digits than its factorization.

21681696332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15001 (or 14999 counting only the distinct ones).

The product of its digits is 559872, while the sum is 47.

The spelling of 21681696332 in words is "twenty-one billion, six hundred eighty-one million, six hundred ninety-six thousand, three hundred thirty-two".