21100299696 has 240 divisors, whose sum is σ = 69350561280. Its totient is φ = 5863173120.

The previous prime is 21100299677. The next prime is 21100299697. The reversal of 21100299696 is 69699200112.

It is a super-2 number, since 2×21100299696² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21100299697) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18142411 + ... + 18143573.

It is an arithmetic number, because the mean of its divisors is an integer number (288960672).

Almost surely, 2^21100299696 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 21100299696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34675280640).

21100299696 is an abundant number, since it is smaller than the sum of its proper divisors (48250261584).

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

21100299696 is a wasteful number, since it uses less digits than its factorization.

21100299696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664 (or 1655 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The spelling of 21100299696 in words is "twenty-one billion, one hundred million, two hundred ninety-nine thousand, six hundred ninety-six".