2100321221 has 2 divisors, whose sum is σ = 2100321222. Its totient is φ = 2100321220.

The previous prime is 2100321217. The next prime is 2100321229. The reversal of 2100321221 is 1221230012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1580937121 + 519384100 = 39761^2 + 22790^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100321221 - 2² = 2100321217 is a prime.

It is a super-2 number, since 2×2100321221² = 8822698462765861682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2100321196 and 2100321205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100321229) 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, 1050160610 + 1050160611.

It is an arithmetic number, because the mean of its divisors is an integer number (1050160611).

Almost surely, 2^2100321221 is an apocalyptic number.

It is an amenable number.

2100321221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100321221 is an equidigital number, since it uses as much as digits as its factorization.

2100321221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2100321221 is about 45829.2616239887. The cubic root of 2100321221 is about 1280.6444551380.

Adding to 2100321221 its reverse (1221230012), we get a palindrome (3321551233).

It can be divided in two parts, 21003 and 21221, that added together give a palindrome (42224).

The spelling of 2100321221 in words is "two billion, one hundred million, three hundred twenty-one thousand, two hundred twenty-one".