121241405 has 8 divisors (see below), whose sum is σ = 145950552. Its totient is φ = 96685888.

The previous prime is 121241383. The next prime is 121241423. The reversal of 121241405 is 504142121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3345241 + 117896164 = 1829^2 + 10858^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121241405 - 2⁸ = 121241149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36662 + ... + 39831.

It is an arithmetic number, because the mean of its divisors is an integer number (18243819).

Almost surely, 2^121241405 is an apocalyptic number.

It is an amenable number.

121241405 is a deficient number, since it is larger than the sum of its proper divisors (24709147).

121241405 is an equidigital number, since it uses as much as digits as its factorization.

121241405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76815.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 121241405 is about 11010.9674870104. The cubic root of 121241405 is about 494.9374542611.

Adding to 121241405 its reverse (504142121), we get a palindrome (625383526).

The spelling of 121241405 in words is "one hundred twenty-one million, two hundred forty-one thousand, four hundred five".