2100991432 has 8 divisors (see below), whose sum is σ = 3939358950. Its totient is φ = 1050495712.

The previous prime is 2100991423. The next prime is 2100991433. The reversal of 2100991432 is 2341990012.

It can be written as a sum of positive squares in only one way, i.e., 1069682436 + 1031308996 = 32706^2 + 32114^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 2100991394 and 2100991403.

It is not an unprimeable number, because it can be changed into a prime (2100991433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131311957 + ... + 131311972.

Almost surely, 2^2100991432 is an apocalyptic number.

It is an amenable number.

2100991432 is a deficient number, since it is larger than the sum of its proper divisors (1838367518).

2100991432 is a wasteful number, since it uses less digits than its factorization.

2100991432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262623935 (or 262623931 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 2100991432 is about 45836.5730830742. The cubic root of 2100991432 is about 1280.7806582283.

The spelling of 2100991432 in words is "two billion, one hundred million, nine hundred ninety-one thousand, four hundred thirty-two".