121226605 has 4 divisors (see below), whose sum is σ = 145471932. Its totient is φ = 96981280.

The previous prime is 121226603. The next prime is 121226617. The reversal of 121226605 is 506622121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 506622121 = 6637 ⋅76333.

It can be written as a sum of positive squares in 2 ways, for example, as 29008996 + 92217609 = 5386^2 + 9603^2 .

It is not a de Polignac number, because 121226605 - 2¹ = 121226603 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121226605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121226603) 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, 12122656 + ... + 12122665.

It is an arithmetic number, because the mean of its divisors is an integer number (36367983).

Almost surely, 2^121226605 is an apocalyptic number.

It is an amenable number.

121226605 is a deficient number, since it is larger than the sum of its proper divisors (24245327).

121226605 is an equidigital number, since it uses as much as digits as its factorization.

121226605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24245326.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 121226605 is about 11010.2954092976. The cubic root of 121226605 is about 494.9173143526.

Adding to 121226605 its reverse (506622121), we get a palindrome (627848726).

The spelling of 121226605 in words is "one hundred twenty-one million, two hundred twenty-six thousand, six hundred five".