2102002121221 has 2 divisors, whose sum is σ = 2102002121222. Its totient is φ = 2102002121220.

The previous prime is 2102002121207. The next prime is 2102002121227. The reversal of 2102002121221 is 1221212002012.

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., 2098184117121 + 3818004100 = 1448511^2 + 61790^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102002121221 - 2²³ = 2101993732613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2102002121195 and 2102002121204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102002121227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051001060610 + 1051001060611.

It is an arithmetic number, because the mean of its divisors is an integer number (1051001060611).

Almost surely, 2^{2102002121221} is an apocalyptic number.

It is an amenable number.

2102002121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102002121221 is an equidigital number, since it uses as much as digits as its factorization.

2102002121221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2102002121221 its reverse (1221212002012), we get a palindrome (3323214123233).

The spelling of 2102002121221 in words is "two trillion, one hundred two billion, two million, one hundred twenty-one thousand, two hundred twenty-one".