1211111210222 has 4 divisors (see below), whose sum is σ = 1816666815336. Its totient is φ = 605555605110.

The previous prime is 1211111210083. The next prime is 1211111210237. The reversal of 1211111210222 is 2220121111121.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1211111210222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302777802554 + ... + 302777802557.

It is an arithmetic number, because the mean of its divisors is an integer number (454166703834).

Almost surely, 2^{1211111210222} is an apocalyptic number.

1211111210222 is a deficient number, since it is larger than the sum of its proper divisors (605555605114).

1211111210222 is an equidigital number, since it uses as much as digits as its factorization.

1211111210222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605555605113.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1211111210222 its reverse (2220121111121), we get a palindrome (3431232321343).

The spelling of 1211111210222 in words is "one trillion, two hundred eleven billion, one hundred eleven million, two hundred ten thousand, two hundred twenty-two".