2101111992 has 96 divisors (see below), whose sum is σ = 6526865280. Its totient is φ = 598155840.

The previous prime is 2101111963. The next prime is 2101111993. The reversal of 2101111992 is 2991111012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101111993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135267 + ... + 149997.

It is an arithmetic number, because the mean of its divisors is an integer number (67988180).

Almost surely, 2^2101111992 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 2101111992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3263432640).

2101111992 is an abundant number, since it is smaller than the sum of its proper divisors (4425753288).

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

2101111992 is a wasteful number, since it uses less digits than its factorization.

2101111992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15033 (or 15026 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 27.

The square root of 2101111992 is about 45837.8881712498. Note that the first 3 decimals coincide. The cubic root of 2101111992 is about 1280.8051558631.

The spelling of 2101111992 in words is "two billion, one hundred one million, one hundred eleven thousand, nine hundred ninety-two".