1213271217 has 20 divisors (see below), whose sum is σ = 1837953216. Its totient is φ = 797451480.

The previous prime is 1213271209. The next prime is 1213271219. The reversal of 1213271217 is 7121723121.

1213271217 is a `hidden beast` number, since 121 + 327 + 1 + 217 = 666.

It is not a de Polignac number, because 1213271217 - 2³ = 1213271209 is a prime.

It is a super-2 number, since 2×1213271217² = 2944054092001322178, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1213271219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 99733 + ... + 111234.

Almost surely, 2^1213271217 is an apocalyptic number.

It is an amenable number.

1213271217 is a deficient number, since it is larger than the sum of its proper divisors (624681999).

1213271217 is an equidigital number, since it uses as much as digits as its factorization.

1213271217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211050 (or 211041 counting only the distinct ones).

The product of its digits is 1176, while the sum is 27.

The square root of 1213271217 is about 34832.0429633405. The cubic root of 1213271217 is about 1066.5616526282.

Adding to 1213271217 its reverse (7121723121), we get a palindrome (8334994338).

The spelling of 1213271217 in words is "one billion, two hundred thirteen million, two hundred seventy-one thousand, two hundred seventeen".