1212132321 has 12 divisors (see below), whose sum is σ = 1798178772. Its totient is φ = 786247776.

The previous prime is 1212132307. The next prime is 1212132347. The reversal of 1212132321 is 1232312121.

1212132321 is a `hidden beast` number, since 1 + 212 + 132 + 321 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 908118225 + 304014096 = 30135^2 + 17436^2 .

It is not a de Polignac number, because 1212132321 - 2⁷ = 1212132193 is a prime.

It is a super-2 number, since 2×1212132321² = 2938529527225694082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1212132294 and 1212132303.

It is not an unprimeable number, because it can be changed into a prime (1212132301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1819686 + ... + 1820351.

It is an arithmetic number, because the mean of its divisors is an integer number (149848231).

Almost surely, 2^1212132321 is an apocalyptic number.

It is an amenable number.

1212132321 is a deficient number, since it is larger than the sum of its proper divisors (586046451).

1212132321 is a wasteful number, since it uses less digits than its factorization.

1212132321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3640080 (or 3640077 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1212132321 is about 34815.6907298994. The cubic root of 1212132321 is about 1066.2278215053.

Adding to 1212132321 its reverse (1232312121), we get a palindrome (2444444442).

The spelling of 1212132321 in words is "one billion, two hundred twelve million, one hundred thirty-two thousand, three hundred twenty-one".