1221222212212 has 12 divisors (see below), whose sum is σ = 2138918345956. Its totient is φ = 610102684800.

The previous prime is 1221222212129. The next prime is 1221222212213. The reversal of 1221222212212 is 2122122221221.

It can be written as a sum of positive squares in 2 ways, for example, as 183521419236 + 1037700792976 = 428394^2 + 1018676^2 .

It is a super-3 number, since 3×1221222212212³ (a number of 37 digits) contains 333 as substring.

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 (1221222212213) 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, 127099923 + ... + 127109530.

Almost surely, 2^{1221222212212} is an apocalyptic number.

It is an amenable number.

1221222212212 is a deficient number, since it is larger than the sum of its proper divisors (917696133744).

1221222212212 is a wasteful number, since it uses less digits than its factorization.

1221222212212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254210658 (or 254210656 counting only the distinct ones).

The product of its digits is 512, while the sum is 22.

Adding to 1221222212212 its reverse (2122122221221), we get a palindrome (3343344433433).

Subtracting 1221222212212 from its reverse (2122122221221), we obtain a palindrome (900900009009).

It can be divided in two parts, 122122221221 and 2, that multiplied together give a palindrome (244244442442).

The spelling of 1221222212212 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, two hundred twelve".