121423405 has 4 divisors (see below), whose sum is σ = 145708092. Its totient is φ = 97138720.

The previous prime is 121423399. The next prime is 121423409. The reversal of 121423405 is 504324121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12659364 + 108764041 = 3558^2 + 10429^2 .

It is not a de Polignac number, because 121423405 - 2²¹ = 119326253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121423409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12142336 + ... + 12142345.

It is an arithmetic number, because the mean of its divisors is an integer number (36427023).

Almost surely, 2^121423405 is an apocalyptic number.

It is an amenable number.

121423405 is a deficient number, since it is larger than the sum of its proper divisors (24284687).

121423405 is an equidigital number, since it uses as much as digits as its factorization.

121423405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24284686.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 121423405 is about 11019.2288750166. The cubic root of 121423405 is about 495.1849868065.

Adding to 121423405 its reverse (504324121), we get a palindrome (625747526).

The spelling of 121423405 in words is "one hundred twenty-one million, four hundred twenty-three thousand, four hundred five".