2100003221 has 2 divisors, whose sum is σ = 2100003222. Its totient is φ = 2100003220.

The previous prime is 2100003197. The next prime is 2100003233. The reversal of 2100003221 is 1223000012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2046567121 + 53436100 = 45239^2 + 7310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100003221 is a prime.

It is a Sophie Germain 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 (2100003121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050001610 + 1050001611.

It is an arithmetic number, because the mean of its divisors is an integer number (1050001611).

Almost surely, 2^2100003221 is an apocalyptic number.

It is an amenable number.

2100003221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100003221 is an equidigital number, since it uses as much as digits as its factorization.

2100003221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 2100003221 is about 45825.7920935361. The cubic root of 2100003221 is about 1280.5798197087.

Adding to 2100003221 its reverse (1223000012), we get a palindrome (3323003233).

The spelling of 2100003221 in words is "two billion, one hundred million, three thousand, two hundred twenty-one".