1212105321 has 24 divisors (see below), whose sum is σ = 2118639744. Its totient is φ = 651888000.

The previous prime is 1212105289. The next prime is 1212105337. The reversal of 1212105321 is 1235012121.

1212105321 is a `hidden beast` number, since 12 + 121 + 0 + 532 + 1 = 666.

It is not a de Polignac number, because 1212105321 - 2⁵ = 1212105289 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1212105294 and 1212105303.

It is not an unprimeable number, because it can be changed into a prime (1212105121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 564805 + ... + 566946.

It is an arithmetic number, because the mean of its divisors is an integer number (88276656).

Almost surely, 2^1212105321 is an apocalyptic number.

It is an amenable number.

1212105321 is a deficient number, since it is larger than the sum of its proper divisors (906534423).

1212105321 is a wasteful number, since it uses less digits than its factorization.

1212105321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131781 (or 1131778 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1212105321 is about 34815.3029715382. The cubic root of 1212105321 is about 1066.2199047775.

Adding to 1212105321 its reverse (1235012121), we get a palindrome (2447117442).

The spelling of 1212105321 in words is "one billion, two hundred twelve million, one hundred five thousand, three hundred twenty-one".