21681696130 has 48 divisors (see below), whose sum is σ = 41524905960. Its totient is φ = 8149311488.

The previous prime is 21681696109. The next prime is 21681696133. The reversal of 21681696130 is 3169618612.

It can be written as a sum of positive squares in 12 ways, for example, as 2277484729 + 19404211401 = 47723^2 + 139299^2 .

It is not an unprimeable number, because it can be changed into a prime (21681696133) 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, 1881426 + ... + 1892914.

Almost surely, 2^21681696130 is an apocalyptic number.

21681696130 is a deficient number, since it is larger than the sum of its proper divisors (19843209830).

21681696130 is a wasteful number, since it uses less digits than its factorization.

21681696130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12183 (or 12166 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 21681696130 in words is "twenty-one billion, six hundred eighty-one million, six hundred ninety-six thousand, one hundred thirty".