1212112321 has 8 divisors (see below), whose sum is σ = 1386325760. Its totient is φ = 1038162528.

The previous prime is 1212112301. The next prime is 1212112331. The reversal of 1212112321 is 1232112121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212112321 - 2⁵ = 1212112289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212112295 and 1212112304.

It is not an unprimeable number, because it can be changed into a prime (1212112301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55956 + ... + 74533.

It is an arithmetic number, because the mean of its divisors is an integer number (173290720).

Almost surely, 2^1212112321 is an apocalyptic number.

It is an amenable number.

1212112321 is a deficient number, since it is larger than the sum of its proper divisors (174213439).

1212112321 is a wasteful number, since it uses less digits than its factorization.

1212112321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131823.

The product of its digits is 48, while the sum is 16.

The square root of 1212112321 is about 34815.4035018984. The cubic root of 1212112321 is about 1066.2219572738.

Adding to 1212112321 its reverse (1232112121), we get a palindrome (2444224442).

It can be divided in two parts, 12121 and 12321, that added together give a palindrome (24442).

The spelling of 1212112321 in words is "one billion, two hundred twelve million, one hundred twelve thousand, three hundred twenty-one".