1213121233091 has 2 divisors, whose sum is σ = 1213121233092. Its totient is φ = 1213121233090.

The previous prime is 1213121233067. The next prime is 1213121233133. The reversal of 1213121233091 is 1903321213121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213121233091 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213121232091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606560616545 + 606560616546.

It is an arithmetic number, because the mean of its divisors is an integer number (606560616546).

Almost surely, 2^{1213121233091} is an apocalyptic number.

1213121233091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213121233091 is an equidigital number, since it uses as much as digits as its factorization.

1213121233091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 29.

The spelling of 1213121233091 in words is "one trillion, two hundred thirteen billion, one hundred twenty-one million, two hundred thirty-three thousand, ninety-one".