121224135 has 16 divisors (see below), whose sum is σ = 194124384. Its totient is φ = 64597632.

The previous prime is 121224133. The next prime is 121224217. The reversal of 121224135 is 531422121.

It is not a de Polignac number, because 121224135 - 2¹ = 121224133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121224133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19689 + ... + 25101.

It is an arithmetic number, because the mean of its divisors is an integer number (12132774).

Almost surely, 2^121224135 is an apocalyptic number.

121224135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121224135 is a deficient number, since it is larger than the sum of its proper divisors (72900249).

121224135 is a wasteful number, since it uses less digits than its factorization.

121224135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6914.

The product of its digits is 480, while the sum is 21.

The square root of 121224135 is about 11010.1832409820. The cubic root of 121224135 is about 494.9139530056.

Adding to 121224135 its reverse (531422121), we get a palindrome (652646256).

The spelling of 121224135 in words is "one hundred twenty-one million, two hundred twenty-four thousand, one hundred thirty-five".