1212456321 has 48 divisors (see below), whose sum is σ = 1833062400. Its totient is φ = 771702624.

The previous prime is 1212456319. The next prime is 1212456341. The reversal of 1212456321 is 1236542121.

1212456321 is a `hidden beast` number, since 1 + 2 + 1 + 24 + 5 + 632 + 1 = 666.

It is not a de Polignac number, because 1212456321 - 2¹ = 1212456319 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1212456341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5072920 + ... + 5073158.

It is an arithmetic number, because the mean of its divisors is an integer number (38188800).

Almost surely, 2^1212456321 is an apocalyptic number.

It is an amenable number.

1212456321 is a deficient number, since it is larger than the sum of its proper divisors (620606079).

1212456321 is a wasteful number, since it uses less digits than its factorization.

1212456321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538 (or 535 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 1212456321 is about 34820.3434934235. The cubic root of 1212456321 is about 1066.3228130704.

Adding to 1212456321 its reverse (1236542121), we get a palindrome (2448998442).

The spelling of 1212456321 in words is "one billion, two hundred twelve million, four hundred fifty-six thousand, three hundred twenty-one".