210303312131221 has 2 divisors, whose sum is σ = 210303312131222. Its totient is φ = 210303312131220.

The previous prime is 210303312131219. The next prime is 210303312131233. The reversal of 210303312131221 is 122131213303012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167575976472996 + 42727335658225 = 12945114^2 + 6536615^2 .

It is a cyclic number.

It is not a de Polignac number, because 210303312131221 - 2¹ = 210303312131219 is a prime.

Together with 210303312131219, 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 (210303312171221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105151656065610 + 105151656065611.

It is an arithmetic number, because the mean of its divisors is an integer number (105151656065611).

Almost surely, 2^{210303312131221} is an apocalyptic number.

It is an amenable number.

210303312131221 is a deficient number, since it is larger than the sum of its proper divisors (1).

210303312131221 is an equidigital number, since it uses as much as digits as its factorization.

210303312131221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 210303312131221 its reverse (122131213303012), we get a palindrome (332434525434233).

The spelling of 210303312131221 in words is "two hundred ten trillion, three hundred three billion, three hundred twelve million, one hundred thirty-one thousand, two hundred twenty-one".