1211210222212 has 24 divisors (see below), whose sum is σ = 2133562046616. Its totient is φ = 601634108928.

The previous prime is 1211210222191. The next prime is 1211210222213. The reversal of 1211210222212 is 2122220121121.

It can be written as a sum of positive squares in 4 ways, for example, as 50384985156 + 1160825237056 = 224466^2 + 1077416^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1211210222212.

It is not an unprimeable number, because it can be changed into a prime (1211210222213) 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 7 ways as a sum of consecutive naturals, for example, 1258533 + ... + 2001580.

It is an arithmetic number, because the mean of its divisors is an integer number (88898418609).

Almost surely, 2^{1211210222212} is an apocalyptic number.

It is an amenable number.

1211210222212 is a deficient number, since it is larger than the sum of its proper divisors (922351824404).

1211210222212 is a wasteful number, since it uses less digits than its factorization.

1211210222212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3260727 (or 3260725 counting only the distinct ones).

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

Adding to 1211210222212 its reverse (2122220121121), we get a palindrome (3333430343333).

The spelling of 1211210222212 in words is "one trillion, two hundred eleven billion, two hundred ten million, two hundred twenty-two thousand, two hundred twelve".