110990021 has 2 divisors, whose sum is σ = 110990022. Its totient is φ = 110990020.

The previous prime is 110989987. The next prime is 110990029. The reversal of 110990021 is 120099011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109516225 + 1473796 = 10465^2 + 1214^2 .

It is a cyclic number.

It is not a de Polignac number, because 110990021 - 2²⁶ = 43881157 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (110990029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55495010 + 55495011.

It is an arithmetic number, because the mean of its divisors is an integer number (55495011).

Almost surely, 2^110990021 is an apocalyptic number.

It is an amenable number.

110990021 is a deficient number, since it is larger than the sum of its proper divisors (1).

110990021 is an equidigital number, since it uses as much as digits as its factorization.

110990021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 110990021 is about 10535.1801598264. The cubic root of 110990021 is about 480.5751511277.

The spelling of 110990021 in words is "one hundred ten million, nine hundred ninety thousand, twenty-one".