1011221312 has 28 divisors (see below), whose sum is σ = 2093890656. Its totient is φ = 483626880.

The previous prime is 1011221311. The next prime is 1011221317. The reversal of 1011221312 is 2131221101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011221311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 342014 + ... + 344957.

Almost surely, 2^1011221312 is an apocalyptic number.

It is an amenable number.

1011221312 is an abundant number, since it is smaller than the sum of its proper divisors (1082669344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1011221312 is an equidigital number, since it uses as much as digits as its factorization.

1011221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687006 (or 686996 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1011221312 is about 31799.7061621645. The cubic root of 1011221312 is about 1003.7265330347.

Adding to 1011221312 its reverse (2131221101), we get a palindrome (3142442413).

The spelling of 1011221312 in words is "one billion, eleven million, two hundred twenty-one thousand, three hundred twelve".