1211122201819 has 2 divisors, whose sum is σ = 1211122201820. Its totient is φ = 1211122201818.

The previous prime is 1211122201811. The next prime is 1211122201841. The reversal of 1211122201819 is 9181022211121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1211122201819 - 2³ = 1211122201811 is a prime.

It is a super-2 number, since 2×1211122201819² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1211122201811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605561100909 + 605561100910.

It is an arithmetic number, because the mean of its divisors is an integer number (605561100910).

Almost surely, 2^{1211122201819} is an apocalyptic number.

1211122201819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211122201819 is an equidigital number, since it uses as much as digits as its factorization.

1211122201819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 31.

The spelling of 1211122201819 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, two hundred one thousand, eight hundred nineteen".