1212271361 has 16 divisors (see below), whose sum is σ = 1427491968. Its totient is φ = 1008028800.

The previous prime is 1212271349. The next prime is 1212271363. The reversal of 1212271361 is 1631722121.

It is a cyclic number.

It is not a de Polignac number, because 1212271361 - 2¹⁰ = 1212270337 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212271361.

It is not an unprimeable number, because it can be changed into a prime (1212271363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11726 + ... + 50616.

It is an arithmetic number, because the mean of its divisors is an integer number (89218248).

Almost surely, 2^1212271361 is an apocalyptic number.

It is an amenable number.

1212271361 is a deficient number, since it is larger than the sum of its proper divisors (215220607).

1212271361 is an equidigital number, since it uses as much as digits as its factorization.

1212271361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39032.

The product of its digits is 1008, while the sum is 26.

The square root of 1212271361 is about 34817.6874734667. The cubic root of 1212271361 is about 1066.2685878600.

Adding to 1212271361 its reverse (1631722121), we get a palindrome (2843993482).

The spelling of 1212271361 in words is "one billion, two hundred twelve million, two hundred seventy-one thousand, three hundred sixty-one".