55021122 has 48 divisors (see below), whose sum is σ = 130181688. Its totient is φ = 16692480.

The previous prime is 55021117. The next prime is 55021151. The reversal of 55021122 is 22112055.

55021122 is a `hidden beast` number, since 550 + 2 + 112 + 2 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 46253601 + 8767521 = 6801^2 + 2961^2 .

It is a super-2 number, since 2×55021122² = 6054647732277768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 55021095 and 55021104.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15472 + ... + 18692.

Almost surely, 2^55021122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55021122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65090844).

55021122 is an abundant number, since it is smaller than the sum of its proper divisors (75160566).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55021122 is a wasteful number, since it uses less digits than its factorization.

55021122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3315 (or 3312 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 55021122 is about 7417.6223953501. The cubic root of 55021122 is about 380.3439222467.

Adding to 55021122 its reverse (22112055), we get a palindrome (77133177).

The spelling of 55021122 in words is "fifty-five million, twenty-one thousand, one hundred twenty-two".