1210121303221 has 2 divisors, whose sum is σ = 1210121303222. Its totient is φ = 1210121303220.

The previous prime is 1210121303219. The next prime is 1210121303243. The reversal of 1210121303221 is 1223031210121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1162547586225 + 47573716996 = 1078215^2 + 218114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210121303221 - 2¹ = 1210121303219 is a prime.

Together with 1210121303219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210121303021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605060651610 + 605060651611.

It is an arithmetic number, because the mean of its divisors is an integer number (605060651611).

Almost surely, 2^{1210121303221} is an apocalyptic number.

It is an amenable number.

1210121303221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210121303221 is an equidigital number, since it uses as much as digits as its factorization.

1210121303221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1210121303221 its reverse (1223031210121), we get a palindrome (2433152513342).

The spelling of 1210121303221 in words is "one trillion, two hundred ten billion, one hundred twenty-one million, three hundred three thousand, two hundred twenty-one".