1211333201231 has 2 divisors, whose sum is σ = 1211333201232. Its totient is φ = 1211333201230.

The previous prime is 1211333201159. The next prime is 1211333201237. The reversal of 1211333201231 is 1321023331121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211333201231 is a prime.

It is a super-2 number, since 2×1211333201231² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211333201197 and 1211333201206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211333201237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605666600615 + 605666600616.

It is an arithmetic number, because the mean of its divisors is an integer number (605666600616).

Almost surely, 2^{1211333201231} is an apocalyptic number.

1211333201231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211333201231 is an equidigital number, since it uses as much as digits as its factorization.

1211333201231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1211333201231 its reverse (1321023331121), we get a palindrome (2532356532352).

The spelling of 1211333201231 in words is "one trillion, two hundred eleven billion, three hundred thirty-three million, two hundred one thousand, two hundred thirty-one".