55121242 has 32 divisors (see below), whose sum is σ = 100543680. Its totient is φ = 22337280.

The previous prime is 55121239. The next prime is 55121243. The reversal of 55121242 is 24212155.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (55121243) 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, 3228 + ... + 10984.

It is an arithmetic number, because the mean of its divisors is an integer number (3141990).

Almost surely, 2^55121242 is an apocalyptic number.

55121242 is a deficient number, since it is larger than the sum of its proper divisors (45422438).

55121242 is a wasteful number, since it uses less digits than its factorization.

55121242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7806.

The product of its digits is 800, while the sum is 22.

The square root of 55121242 is about 7424.3681212612. The cubic root of 55121242 is about 380.5744819408.

Adding to 55121242 its reverse (24212155), we get a palindrome (79333397).

The spelling of 55121242 in words is "fifty-five million, one hundred twenty-one thousand, two hundred forty-two".