1312221220312 has 16 divisors (see below), whose sum is σ = 2460978780840. Its totient is φ = 655960212096.

The previous prime is 1312221220291. The next prime is 1312221220357. The reversal of 1312221220312 is 2130221222131.

It is a super-2 number, since 2×1312221220312² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

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, 18762673 + ... + 18832480.

Almost surely, 2^{1312221220312} is an apocalyptic number.

It is an amenable number.

1312221220312 is a deficient number, since it is larger than the sum of its proper divisors (1148757560528).

1312221220312 is a wasteful number, since it uses less digits than its factorization.

1312221220312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37599522 (or 37599518 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 1312221220312 its reverse (2130221222131), we get a palindrome (3442442442443).

The spelling of 1312221220312 in words is "one trillion, three hundred twelve billion, two hundred twenty-one million, two hundred twenty thousand, three hundred twelve".