1221212131133 has 2 divisors, whose sum is σ = 1221212131134. Its totient is φ = 1221212131132.

The previous prime is 1221212131067. The next prime is 1221212131141. The reversal of 1221212131133 is 3311312121221.

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., 868991246809 + 352220884324 = 932197^2 + 593482^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221212131133 - 2²² = 1221207936829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1221212131099 and 1221212131108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221212131163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610606065566 + 610606065567.

It is an arithmetic number, because the mean of its divisors is an integer number (610606065567).

Almost surely, 2^{1221212131133} is an apocalyptic number.

It is an amenable number.

1221212131133 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221212131133 is an equidigital number, since it uses as much as digits as its factorization.

1221212131133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 23.

Adding to 1221212131133 its reverse (3311312121221), we get a palindrome (4532524252354).

The spelling of 1221212131133 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, one hundred thirty-one thousand, one hundred thirty-three".