55122211 has 16 divisors (see below), whose sum is σ = 62760960. Its totient is φ = 48090240.

The previous prime is 55122203. The next prime is 55122217. The reversal of 55122211 is 11222155.

It is a cyclic number.

It is not a de Polignac number, because 55122211 - 2³ = 55122203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55122217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13366 + ... + 16996.

It is an arithmetic number, because the mean of its divisors is an integer number (3922560).

Almost surely, 2^55122211 is an apocalyptic number.

55122211 is a deficient number, since it is larger than the sum of its proper divisors (7638749).

55122211 is a wasteful number, since it uses less digits than its factorization.

55122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3714.

The product of its digits is 200, while the sum is 19.

The square root of 55122211 is about 7424.4333790532. The cubic root of 55122211 is about 380.5767120219.

Adding to 55122211 its reverse (11222155), we get a palindrome (66344366).

The spelling of 55122211 in words is "fifty-five million, one hundred twenty-two thousand, two hundred eleven".