55212210 has 24 divisors (see below), whose sum is σ = 143551980. Its totient is φ = 14723232.

The previous prime is 55212203. The next prime is 55212217. The reversal of 55212210 is 1221255.

55212210 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55212203) and next prime (55212217).

It can be written as a sum of positive squares in 2 ways, for example, as 51279921 + 3932289 = 7161^2 + 1983^2 .

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

It is not an unprimeable number, because it can be changed into a prime (55212217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 306645 + ... + 306824.

Almost surely, 2^55212210 is an apocalyptic number.

55212210 is an abundant number, since it is smaller than the sum of its proper divisors (88339770).

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

55212210 is a wasteful number, since it uses less digits than its factorization.

55212210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613482 (or 613479 counting only the distinct ones).

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

The square root of 55212210 is about 7430.4919083463. The cubic root of 55212210 is about 380.7837241546.

Adding to 55212210 its reverse (1221255), we get a palindrome (56433465).

It can be divided in two parts, 55212 and 210, that multiplied together give a triangular number (11594520 = T₄₈₁₅).

The spelling of 55212210 in words is "fifty-five million, two hundred twelve thousand, two hundred ten".