121456403 has 2 divisors, whose sum is σ = 121456404. Its totient is φ = 121456402.

The previous prime is 121456369. The next prime is 121456409. The reversal of 121456403 is 304654121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121456403 - 2¹⁸ = 121194259 is a prime.

It is not a weakly prime, because it can be changed into another prime (121456409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60728201 + 60728202.

It is an arithmetic number, because the mean of its divisors is an integer number (60728202).

Almost surely, 2^121456403 is an apocalyptic number.

121456403 is a deficient number, since it is larger than the sum of its proper divisors (1).

121456403 is an equidigital number, since it uses as much as digits as its factorization.

121456403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 121456403 is about 11020.7260650104. The cubic root of 121456403 is about 495.2298398676.

The spelling of 121456403 in words is "one hundred twenty-one million, four hundred fifty-six thousand, four hundred three".