121421423 has 2 divisors, whose sum is σ = 121421424. Its totient is φ = 121421422.

The previous prime is 121421413. The next prime is 121421453. The reversal of 121421423 is 324124121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121421423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121421395 and 121421404.

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 (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60710711 + 60710712.

It is an arithmetic number, because the mean of its divisors is an integer number (60710712).

Almost surely, 2^121421423 is an apocalyptic number.

121421423 is a deficient number, since it is larger than the sum of its proper divisors (1).

121421423 is an equidigital number, since it uses as much as digits as its factorization.

121421423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 20.

The square root of 121421423 is about 11019.1389409518. The cubic root of 121421423 is about 495.1822924825.

Adding to 121421423 its reverse (324124121), we get a palindrome (445545544).

The spelling of 121421423 in words is "one hundred twenty-one million, four hundred twenty-one thousand, four hundred twenty-three".