2100090221 has 2 divisors, whose sum is σ = 2100090222. Its totient is φ = 2100090220.

The previous prime is 2100090217. The next prime is 2100090241. The reversal of 2100090221 is 1220900012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1981585225 + 118504996 = 44515^2 + 10886^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100090221 - 2² = 2100090217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2100090221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100090241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050045110 + 1050045111.

It is an arithmetic number, because the mean of its divisors is an integer number (1050045111).

Almost surely, 2^2100090221 is an apocalyptic number.

It is an amenable number.

2100090221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100090221 is an equidigital number, since it uses as much as digits as its factorization.

2100090221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 2100090221 is about 45826.7413307994. The cubic root of 2100090221 is about 1280.5975036348.

Adding to 2100090221 its reverse (1220900012), we get a palindrome (3320990233).

The spelling of 2100090221 in words is "two billion, one hundred million, ninety thousand, two hundred twenty-one".