1213222212 has 84 divisors (see below), whose sum is σ = 3193221360. Its totient is φ = 403142832.

The previous prime is 1213222183. The next prime is 1213222243. The reversal of 1213222212 is 2122223121.

1213222212 is a `hidden beast` number, since 121 + 322 + 221 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 27 ways as a sum of consecutive naturals, for example, 1641339 + ... + 1642077.

It is an arithmetic number, because the mean of its divisors is an integer number (38014540).

Almost surely, 2^1213222212 is an apocalyptic number.

1213222212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213222212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1596610680).

1213222212 is an abundant number, since it is smaller than the sum of its proper divisors (1979999148).

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

1213222212 is an equidigital number, since it uses as much as digits as its factorization.

1213222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324 (or 1307 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 1213222212 is about 34831.3395091260. The cubic root of 1213222212 is about 1066.5472926740.

Adding to 1213222212 its reverse (2122223121), we get a palindrome (3335445333).

Subtracting 1213222212 from its reverse (2122223121), we obtain a palindrome (909000909).

The spelling of 1213222212 in words is "one billion, two hundred thirteen million, two hundred twenty-two thousand, two hundred twelve".