1156421217 has 12 divisors (see below), whose sum is σ = 1793633136. Its totient is φ = 660812040.

The previous prime is 1156421213. The next prime is 1156421239. The reversal of 1156421217 is 7121246511.

It is not a de Polignac number, because 1156421217 - 2² = 1156421213 is a prime.

It is a super-2 number, since 2×1156421217² = 2674620062255522178, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1156421213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3933259 + ... + 3933552.

It is an arithmetic number, because the mean of its divisors is an integer number (149469428).

Almost surely, 2^1156421217 is an apocalyptic number.

It is an amenable number.

1156421217 is a deficient number, since it is larger than the sum of its proper divisors (637211919).

1156421217 is an equidigital number, since it uses as much as digits as its factorization.

1156421217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7866828 (or 7866821 counting only the distinct ones).

The product of its digits is 3360, while the sum is 30.

The square root of 1156421217 is about 34006.1938034823. The cubic root of 1156421217 is about 1049.6359182157.

Adding to 1156421217 its reverse (7121246511), we get a palindrome (8277667728).

The spelling of 1156421217 in words is "one billion, one hundred fifty-six million, four hundred twenty-one thousand, two hundred seventeen".