21010111100992 has 112 divisors (see below), whose sum is σ = 45768165674560. Its totient is φ = 9510524762112.

The previous prime is 21010111100989. The next prime is 21010111101013. The reversal of 21010111100992 is 29900111101012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21010111100992.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11942443 + ... + 13588309.

It is an arithmetic number, because the mean of its divisors is an integer number (408644336380).

Almost surely, 2^{21010111100992} 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 21010111100992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22884082837280).

21010111100992 is an abundant number, since it is smaller than the sum of its proper divisors (24758054573568).

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

21010111100992 is a wasteful number, since it uses less digits than its factorization.

21010111100992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646188 (or 1646178 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 28.

The spelling of 21010111100992 in words is "twenty-one trillion, ten billion, one hundred eleven million, one hundred thousand, nine hundred ninety-two".