2100991433 has 2 divisors, whose sum is σ = 2100991434. Its totient is φ = 2100991432.

The previous prime is 2100991423. The next prime is 2100991439. The reversal of 2100991433 is 3341990012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1728231184 + 372760249 = 41572^2 + 19307^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100991433 - 2⁶ = 2100991369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2100991433.

It is not a weakly prime, because it can be changed into another prime (2100991439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050495716 + 1050495717.

It is an arithmetic number, because the mean of its divisors is an integer number (1050495717).

Almost surely, 2^2100991433 is an apocalyptic number.

It is an amenable number.

2100991433 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100991433 is an equidigital number, since it uses as much as digits as its factorization.

2100991433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 2100991433 is about 45836.5730939825. The cubic root of 2100991433 is about 1280.7806584315.

The spelling of 2100991433 in words is "two billion, one hundred million, nine hundred ninety-one thousand, four hundred thirty-three".