1221222212 has 24 divisors (see below), whose sum is σ = 2450167104. Its totient is φ = 521726112.

The previous prime is 1221222203. The next prime is 1221222229. The reversal of 1221222212 is 2122221221.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59918 + ... + 77669.

It is an arithmetic number, because the mean of its divisors is an integer number (102090296).

Almost surely, 2^1221222212 is an apocalyptic number.

It is an amenable number.

1221222212 is an abundant number, since it is smaller than the sum of its proper divisors (1228944892).

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

1221222212 is a wasteful number, since it uses less digits than its factorization.

1221222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137915 (or 137913 counting only the distinct ones).

The product of its digits is 128, while the sum is 17.

The square root of 1221222212 is about 34945.9899273150. The cubic root of 1221222212 is about 1068.8864334244.

Adding to 1221222212 its reverse (2122221221), we get a palindrome (3343443433).

Subtracting 1221222212 from its reverse (2122221221), we obtain a palindrome (900999009).

The spelling of 1221222212 in words is "one billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twelve".