181210222 has 4 divisors (see below), whose sum is σ = 271815336. Its totient is φ = 90605110.

The previous prime is 181210217. The next prime is 181210229. The reversal of 181210222 is 222012181.

181210222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 222012181 = 109 ⋅2036809.

It is a self number, because there is not a number n which added to its sum of digits gives 181210222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181210229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45302554 + ... + 45302557.

It is an arithmetic number, because the mean of its divisors is an integer number (67953834).

Almost surely, 2^181210222 is an apocalyptic number.

181210222 is a deficient number, since it is larger than the sum of its proper divisors (90605114).

181210222 is an equidigital number, since it uses as much as digits as its factorization.

181210222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90605113.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 181210222 is about 13461.4346189401. The cubic root of 181210222 is about 565.8841946979.

The spelling of 181210222 in words is "one hundred eighty-one million, two hundred ten thousand, two hundred twenty-two".