1211213322251 has 2 divisors, whose sum is σ = 1211213322252. Its totient is φ = 1211213322250.

The previous prime is 1211213322247. The next prime is 1211213322311. The reversal of 1211213322251 is 1522233121121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211213322251 - 2² = 1211213322247 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211213322251.

It is not a weakly prime, because it can be changed into another prime (1211213372251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605606661125 + 605606661126.

It is an arithmetic number, because the mean of its divisors is an integer number (605606661126).

Almost surely, 2^{1211213322251} is an apocalyptic number.

1211213322251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211213322251 is an equidigital number, since it uses as much as digits as its factorization.

1211213322251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 26.

Adding to 1211213322251 its reverse (1522233121121), we get a palindrome (2733446443372).

The spelling of 1211213322251 in words is "one trillion, two hundred eleven billion, two hundred thirteen million, three hundred twenty-two thousand, two hundred fifty-one".