1221302312 has 16 divisors (see below), whose sum is σ = 2312175840. Its totient is φ = 604722096.

The previous prime is 1221302281. The next prime is 1221302333. The reversal of 1221302312 is 2132031221.

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, 740258 + ... + 741905.

It is an arithmetic number, because the mean of its divisors is an integer number (144510990).

Almost surely, 2^1221302312 is an apocalyptic number.

It is an amenable number.

1221302312 is a deficient number, since it is larger than the sum of its proper divisors (1090873528).

1221302312 is a wasteful number, since it uses less digits than its factorization.

1221302312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482272 (or 1482268 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1221302312 is about 34947.1359627652. The cubic root of 1221302312 is about 1068.9098023442.

Adding to 1221302312 its reverse (2132031221), we get a palindrome (3353333533).

The spelling of 1221302312 in words is "one billion, two hundred twenty-one million, three hundred two thousand, three hundred twelve".