21613180684 has 24 divisors (see below), whose sum is σ = 39553986528. Its totient is φ = 10314099840.

The previous prime is 21613180681. The next prime is 21613180717. The reversal of 21613180684 is 48608131612.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21613180681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214987 + ... + 299074.

It is an arithmetic number, because the mean of its divisors is an integer number (1648082772).

Almost surely, 2^21613180684 is an apocalyptic number.

It is an amenable number.

21613180684 is a deficient number, since it is larger than the sum of its proper divisors (17940805844).

21613180684 is a wasteful number, since it uses less digits than its factorization.

21613180684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514545 (or 514543 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The spelling of 21613180684 in words is "twenty-one billion, six hundred thirteen million, one hundred eighty thousand, six hundred eighty-four".