1221312330212 has 12 divisors (see below), whose sum is σ = 2301704007036. Its totient is φ = 563682613920.

The previous prime is 1221312330181. The next prime is 1221312330221. The reversal of 1221312330212 is 2120332131221.

It can be written as a sum of positive squares in 2 ways, for example, as 66989862976 + 1154322467236 = 258824^2 + 1074394^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11743387739 + ... + 11743387842.

It is an arithmetic number, because the mean of its divisors is an integer number (191808667253).

Almost surely, 2^{1221312330212} is an apocalyptic number.

It is an amenable number.

1221312330212 is a deficient number, since it is larger than the sum of its proper divisors (1080391676824).

1221312330212 is a wasteful number, since it uses less digits than its factorization.

1221312330212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23486775598 (or 23486775596 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1221312330212 its reverse (2120332131221), we get a palindrome (3341644461433).

The spelling of 1221312330212 in words is "one trillion, two hundred twenty-one billion, three hundred twelve million, three hundred thirty thousand, two hundred twelve".