2101111988 has 24 divisors (see below), whose sum is σ = 3748950408. Its totient is φ = 1030150656.

The previous prime is 2101111963. The next prime is 2101111993. The reversal of 2101111988 is 8891111012.

It can be written as a sum of positive squares in 4 ways, for example, as 485232784 + 1615879204 = 22028^2 + 40198^2 .

It is a super-2 number, since 2×2101111988² = 8829343172234624288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29720 + ... + 71312.

It is an arithmetic number, because the mean of its divisors is an integer number (156206267).

Almost surely, 2^2101111988 is an apocalyptic number.

It is an amenable number.

2101111988 is a deficient number, since it is larger than the sum of its proper divisors (1647838420).

2101111988 is a wasteful number, since it uses less digits than its factorization.

2101111988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41843 (or 41841 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 32.

The square root of 2101111988 is about 45837.8881276177. Note that the first 3 decimals coincide. The cubic root of 2101111988 is about 1280.8051550503.

The spelling of 2101111988 in words is "two billion, one hundred one million, one hundred eleven thousand, nine hundred eighty-eight".