121213453 has 2 divisors, whose sum is σ = 121213454. Its totient is φ = 121213452.

The previous prime is 121213429. The next prime is 121213471. The reversal of 121213453 is 354312121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80227849 + 40985604 = 8957^2 + 6402^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121213453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121213403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60606726 + 60606727.

It is an arithmetic number, because the mean of its divisors is an integer number (60606727).

Almost surely, 2^121213453 is an apocalyptic number.

It is an amenable number.

121213453 is a deficient number, since it is larger than the sum of its proper divisors (1).

121213453 is an equidigital number, since it uses as much as digits as its factorization.

121213453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 121213453 is about 11009.6981339181. The cubic root of 121213453 is about 494.8994156745.

Adding to 121213453 its reverse (354312121), we get a palindrome (475525574).

The spelling of 121213453 in words is "one hundred twenty-one million, two hundred thirteen thousand, four hundred fifty-three".