121421453 has 2 divisors, whose sum is σ = 121421454. Its totient is φ = 121421452.

The previous prime is 121421423. The next prime is 121421473. The reversal of 121421453 is 354124121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78623689 + 42797764 = 8867^2 + 6542^2 .

It is a cyclic number.

It is not a de Polignac number, because 121421453 - 2⁸ = 121421197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121421413) 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, 60710726 + 60710727.

It is an arithmetic number, because the mean of its divisors is an integer number (60710727).

Almost surely, 2^121421453 is an apocalyptic number.

It is an amenable number.

121421453 is a deficient number, since it is larger than the sum of its proper divisors (1).

121421453 is an equidigital number, since it uses as much as digits as its factorization.

121421453 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 23.

The square root of 121421453 is about 11019.1403022196. The cubic root of 121421453 is about 495.1823332646.

Adding to 121421453 its reverse (354124121), we get a palindrome (475545574).

The spelling of 121421453 in words is "one hundred twenty-one million, four hundred twenty-one thousand, four hundred fifty-three".