1212320331 has 16 divisors (see below), whose sum is σ = 1808956800. Its totient is φ = 802396584.

The previous prime is 1212320309. The next prime is 1212320341. The reversal of 1212320331 is 1330232121.

1212320331 is a `hidden beast` number, since 1 + 2 + 12 + 320 + 331 = 666.

It is not a de Polignac number, because 1212320331 - 2¹³ = 1212312139 is a prime.

It is a super-2 number, since 2×1212320331² = 2939441169911899122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1212320341) 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 15 ways as a sum of consecutive naturals, for example, 157761 + ... + 165266.

It is an arithmetic number, because the mean of its divisors is an integer number (113059800).

Almost surely, 2^1212320331 is an apocalyptic number.

1212320331 is a deficient number, since it is larger than the sum of its proper divisors (596636469).

1212320331 is a wasteful number, since it uses less digits than its factorization.

1212320331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323175 (or 323169 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1212320331 is about 34818.3907008925. The cubic root of 1212320331 is about 1066.2829450607.

Adding to 1212320331 its reverse (1330232121), we get a palindrome (2542552452).

The spelling of 1212320331 in words is "one billion, two hundred twelve million, three hundred twenty thousand, three hundred thirty-one".