21066700116 has 96 divisors (see below), whose sum is σ = 61393812480. Its totient is φ = 5462150400.

The previous prime is 21066700099. The next prime is 21066700121. The reversal of 21066700116 is 61100766012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 507640 + ... + 547568.

It is an arithmetic number, because the mean of its divisors is an integer number (639518880).

Almost surely, 2^21066700116 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21066700116, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30696906240).

21066700116 is an abundant number, since it is smaller than the sum of its proper divisors (40327112364).

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

21066700116 is a wasteful number, since it uses less digits than its factorization.

21066700116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40525 (or 40523 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The spelling of 21066700116 in words is "twenty-one billion, sixty-six million, seven hundred thousand, one hundred sixteen".