21109896192 has 792 divisors, whose sum is σ = 76970802720. Its totient is φ = 5109350400.

The previous prime is 21109896127. The next prime is 21109896193. The reversal of 21109896192 is 29169890112.

It is a super-2 number, since 2×21109896192² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21109896193) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 346063842 + ... + 346063902.

Almost surely, 2^21109896192 is an apocalyptic number.

21109896192 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21109896192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38485401360).

21109896192 is an abundant number, since it is smaller than the sum of its proper divisors (55860906528).

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

21109896192 is a wasteful number, since it uses less digits than its factorization.

21109896192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 103 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 48.

The spelling of 21109896192 in words is "twenty-one billion, one hundred nine million, eight hundred ninety-six thousand, one hundred ninety-two".