1221211212222 has 8 divisors (see below), whose sum is σ = 2442422424456. Its totient is φ = 407070404072.

The previous prime is 1221211212211. The next prime is 1221211212223. The reversal of 1221211212222 is 2222121121221.

It is a sphenic number, since it is the product of 3 distinct primes.

1221211212222 is an admirable number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221211212223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101767601013 + ... + 101767601024.

It is an arithmetic number, because the mean of its divisors is an integer number (305302803057).

Almost surely, 2^{1221211212222} is an apocalyptic number.

1221211212222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1221211212222 is a wasteful number, since it uses less digits than its factorization.

1221211212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203535202042.

The product of its digits is 256, while the sum is 21.

Adding to 1221211212222 its reverse (2222121121221), we get a palindrome (3443332333443).

The spelling of 1221211212222 in words is "one trillion, two hundred twenty-one billion, two hundred eleven million, two hundred twelve thousand, two hundred twenty-two".