21613180686 has 16 divisors (see below), whose sum is σ = 44041953744. Its totient is φ = 7068461504.

The previous prime is 21613180681. The next prime is 21613180717. The reversal of 21613180686 is 68608131612.

It is a congruent number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33982671 + ... + 33983306.

It is an arithmetic number, because the mean of its divisors is an integer number (2752622109).

Almost surely, 2^21613180686 is an apocalyptic number.

21613180686 is an abundant number, since it is smaller than the sum of its proper divisors (22428773058).

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

21613180686 is a wasteful number, since it uses less digits than its factorization.

21613180686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67966035.

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 21613180686 in words is "twenty-one billion, six hundred thirteen million, one hundred eighty thousand, six hundred eighty-six".