121221211949 has 2 divisors, whose sum is σ = 121221211950. Its totient is φ = 121221211948.

The previous prime is 121221211883. The next prime is 121221211957. The reversal of 121221211949 is 949112122121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114950155849 + 6271056100 = 339043^2 + 79190^2 .

It is an emirp because it is prime and its reverse (949112122121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121221211949 - 2⁸ = 121221211693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121221211249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610605974 + 60610605975.

It is an arithmetic number, because the mean of its divisors is an integer number (60610605975).

Almost surely, 2^121221211949 is an apocalyptic number.

It is an amenable number.

121221211949 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221211949 is an equidigital number, since it uses as much as digits as its factorization.

121221211949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 35.

The spelling of 121221211949 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred eleven thousand, nine hundred forty-nine".