55220242 has 16 divisors (see below), whose sum is σ = 103269312. Its totient is φ = 21514320.

The previous prime is 55220237. The next prime is 55220273. The reversal of 55220242 is 24202255.

It is a happy number.

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

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, 179133 + ... + 179440.

It is an arithmetic number, because the mean of its divisors is an integer number (6454332).

Almost surely, 2^55220242 is an apocalyptic number.

55220242 is a deficient number, since it is larger than the sum of its proper divisors (48049070).

55220242 is a wasteful number, since it uses less digits than its factorization.

55220242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358593.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 55220242 is about 7431.0323643488. The cubic root of 55220242 is about 380.8021881053.

Adding to 55220242 its reverse (24202255), we get a palindrome (79422497).

The spelling of 55220242 in words is "fifty-five million, two hundred twenty thousand, two hundred forty-two".