1212421312 has 28 divisors (see below), whose sum is σ = 2532527320. Its totient is φ = 574304256.

The previous prime is 1212421307. The next prime is 1212421313. The reversal of 1212421312 is 2131242121.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 1212421312.

It is not an unprimeable number, because it can be changed into a prime (1212421313) 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, 497313 + ... + 499744.

Almost surely, 2^1212421312 is an apocalyptic number.

It is an amenable number.

1212421312 is an abundant number, since it is smaller than the sum of its proper divisors (1320106008).

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

1212421312 is an equidigital number, since it uses as much as digits as its factorization.

1212421312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997088 (or 997078 counting only the distinct ones).

The product of its digits is 192, while the sum is 19.

The square root of 1212421312 is about 34819.8407807962. The cubic root of 1212421312 is about 1066.3125498128.

Adding to 1212421312 its reverse (2131242121), we get a palindrome (3343663433).

The spelling of 1212421312 in words is "one billion, two hundred twelve million, four hundred twenty-one thousand, three hundred twelve".