1211101312 has 16 divisors (see below), whose sum is σ = 2412741150. Its totient is φ = 605550592.

The previous prime is 1211101261. The next prime is 1211101327. The reversal of 1211101312 is 2131011121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1190526016 + 20575296 = 34504^2 + 4536^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 1211101292 and 1211101301.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4730737 + ... + 4730992.

Almost surely, 2^1211101312 is an apocalyptic number.

It is an amenable number.

1211101312 is a deficient number, since it is larger than the sum of its proper divisors (1201639838).

1211101312 is an frugal number, since it uses more digits than its factorization.

1211101312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9461743 (or 9461731 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1211101312 is about 34800.8809083908. The cubic root of 1211101312 is about 1065.9254336432.

Adding to 1211101312 its reverse (2131011121), we get a palindrome (3342112433).

The spelling of 1211101312 in words is "one billion, two hundred eleven million, one hundred one thousand, three hundred twelve".