1121212221749 has 2 divisors, whose sum is σ = 1121212221750. Its totient is φ = 1121212221748.

The previous prime is 1121212221691. The next prime is 1121212221769. The reversal of 1121212221749 is 9471222121211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 815174236900 + 306037984849 = 902870^2 + 553207^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121212221749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121212221769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560606110874 + 560606110875.

It is an arithmetic number, because the mean of its divisors is an integer number (560606110875).

Almost surely, 2^{1121212221749} is an apocalyptic number.

It is an amenable number.

1121212221749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121212221749 is an equidigital number, since it uses as much as digits as its factorization.

1121212221749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 35.

The spelling of 1121212221749 in words is "one trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, seven hundred forty-nine".