121224491 has 2 divisors, whose sum is σ = 121224492. Its totient is φ = 121224490.

The previous prime is 121224487. The next prime is 121224517. The reversal of 121224491 is 194422121.

It is an a-pointer prime, because the next prime (121224517) can be obtained adding 121224491 to its sum of digits (26).

It is a weak prime.

It is an emirp because it is prime and its reverse (194422121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121224491 - 2² = 121224487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121224491.

It is not a weakly prime, because it can be changed into another prime (121224431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60612245 + 60612246.

It is an arithmetic number, because the mean of its divisors is an integer number (60612246).

Almost surely, 2^121224491 is an apocalyptic number.

121224491 is a deficient number, since it is larger than the sum of its proper divisors (1).

121224491 is an equidigital number, since it uses as much as digits as its factorization.

121224491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 26.

The square root of 121224491 is about 11010.1994078218. The cubic root of 121224491 is about 494.9144374778.

The spelling of 121224491 in words is "one hundred twenty-one million, two hundred twenty-four thousand, four hundred ninety-one".