1221134311237 has 2 divisors, whose sum is σ = 1221134311238. Its totient is φ = 1221134311236.

The previous prime is 1221134311211. The next prime is 1221134311247. The reversal of 1221134311237 is 7321134311221.

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., 1219630888161 + 1503423076 = 1104369^2 + 38774^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221134311237 - 2¹⁹ = 1221133786949 is a prime.

It is a super-3 number, since 3×1221134311237³ (a number of 37 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221134311199 and 1221134311208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221134311247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610567155618 + 610567155619.

It is an arithmetic number, because the mean of its divisors is an integer number (610567155619).

Almost surely, 2^{1221134311237} is an apocalyptic number.

It is an amenable number.

1221134311237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221134311237 is an equidigital number, since it uses as much as digits as its factorization.

1221134311237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

Adding to 1221134311237 its reverse (7321134311221), we get a palindrome (8542268622458).

The spelling of 1221134311237 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-four million, three hundred eleven thousand, two hundred thirty-seven".