1212231321 has 12 divisors (see below), whose sum is σ = 2001143872. Its totient is φ = 692703576.

The previous prime is 1212231301. The next prime is 1212231329. The reversal of 1212231321 is 1231322121.

1212231321 is a `hidden beast` number, since 121 + 223 + 1 + 321 = 666.

It is not a de Polignac number, because 1212231321 - 2⁵ = 1212231289 is a prime.

It is a super-2 number, since 2×1212231321² = 2939009551226810082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1212231294 and 1212231303.

It is not an unprimeable number, because it can be changed into a prime (1212231329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9620821 + ... + 9620946.

Almost surely, 2^1212231321 is an apocalyptic number.

It is an amenable number.

1212231321 is a deficient number, since it is larger than the sum of its proper divisors (788912551).

1212231321 is a wasteful number, since it uses less digits than its factorization.

1212231321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19241780 (or 19241777 counting only the distinct ones).

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

The square root of 1212231321 is about 34817.1124736099. The cubic root of 1212231321 is about 1066.2568485015.

Adding to 1212231321 its reverse (1231322121), we get a palindrome (2443553442).

The spelling of 1212231321 in words is "one billion, two hundred twelve million, two hundred thirty-one thousand, three hundred twenty-one".