1212213228 has 48 divisors (see below), whose sum is σ = 2879649024. Its totient is φ = 396786240.

The previous prime is 1212213227. The next prime is 1212213241. The reversal of 1212213228 is 8223122121.

It is a junction number, because it is equal to n+sod(n) for n = 1212213198 and 1212213207.

It is not an unprimeable number, because it can be changed into a prime (1212213227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 648351 + ... + 650217.

It is an arithmetic number, because the mean of its divisors is an integer number (59992688).

Almost surely, 2^1212213228 is an apocalyptic number.

It is an amenable number.

1212213228 is an abundant number, since it is smaller than the sum of its proper divisors (1667435796).

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

1212213228 is a wasteful number, since it uses less digits than its factorization.

1212213228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2822 (or 2820 counting only the distinct ones).

The product of its digits is 768, while the sum is 24.

The square root of 1212213228 is about 34816.8526435116. The cubic root of 1212213228 is about 1066.2515437161.

Adding to 1212213228 its reverse (8223122121), we get a palindrome (9435335349).

The spelling of 1212213228 in words is "one billion, two hundred twelve million, two hundred thirteen thousand, two hundred twenty-eight".