11221212199997 has 2 divisors, whose sum is σ = 11221212199998. Its totient is φ = 11221212199996.

The previous prime is 11221212199949. The next prime is 11221212200057. The reversal of 11221212199997 is 79999121212211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8868835407481 + 2352376792516 = 2978059^2 + 1533746^2 .

It is a cyclic number.

It is not a de Polignac number, because 11221212199997 - 2¹⁸ = 11221211937853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11221212195997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610606099998 + 5610606099999.

It is an arithmetic number, because the mean of its divisors is an integer number (5610606099999).

Almost surely, 2^{11221212199997} is an apocalyptic number.

It is an amenable number.

11221212199997 is a deficient number, since it is larger than the sum of its proper divisors (1).

11221212199997 is an equidigital number, since it uses as much as digits as its factorization.

11221212199997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 56.

The spelling of 11221212199997 in words is "eleven trillion, two hundred twenty-one billion, two hundred twelve million, one hundred ninety-nine thousand, nine hundred ninety-seven".