1221432163 has 6 divisors (see below), whose sum is σ = 1420849716. Its totient is φ = 1046941812.

The previous prime is 1221432139. The next prime is 1221432169. The reversal of 1221432163 is 3612341221.

It is not a de Polignac number, because 1221432163 - 2²¹ = 1219335011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221432169) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12463545 + ... + 12463642.

It is an arithmetic number, because the mean of its divisors is an integer number (236808286).

Almost surely, 2^1221432163 is an apocalyptic number.

1221432163 is a deficient number, since it is larger than the sum of its proper divisors (199417553).

1221432163 is an equidigital number, since it uses as much as digits as its factorization.

1221432163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24927201 (or 24927194 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The square root of 1221432163 is about 34948.9937337257. The cubic root of 1221432163 is about 1068.9476837888.

Adding to 1221432163 its reverse (3612341221), we get a palindrome (4833773384).

The spelling of 1221432163 in words is "one billion, two hundred twenty-one million, four hundred thirty-two thousand, one hundred sixty-three".