1121212221949 has 2 divisors, whose sum is σ = 1121212221950. Its totient is φ = 1121212221948.

The previous prime is 1121212221937. The next prime is 1121212222021. The reversal of 1121212221949 is 9491222121211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1022353543225 + 98858678724 = 1011115^2 + 314418^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121212221949 - 2⁷ = 1121212221821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121212221749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560606110974 + 560606110975.

It is an arithmetic number, because the mean of its divisors is an integer number (560606110975).

Almost surely, 2^{1121212221949} is an apocalyptic number.

It is an amenable number.

1121212221949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121212221949 is an equidigital number, since it uses as much as digits as its factorization.

1121212221949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 37.

The spelling of 1121212221949 in words is "one trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, nine hundred forty-nine".