1221026163 has 16 divisors (see below), whose sum is σ = 1861353216. Its totient is φ = 697451040.

The previous prime is 1221026161. The next prime is 1221026167. The reversal of 1221026163 is 3616201221.

It is not a de Polignac number, because 1221026163 - 2¹ = 1221026161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221026161) 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, 49920 + ... + 70242.

It is an arithmetic number, because the mean of its divisors is an integer number (116334576).

Almost surely, 2^1221026163 is an apocalyptic number.

1221026163 is a deficient number, since it is larger than the sum of its proper divisors (640327053).

1221026163 is a wasteful number, since it uses less digits than its factorization.

1221026163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23194.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1221026163 is about 34943.1847861640. The cubic root of 1221026163 is about 1068.8292324420.

Adding to 1221026163 its reverse (3616201221), we get a palindrome (4837227384).

The spelling of 1221026163 in words is "one billion, two hundred twenty-one million, twenty-six thousand, one hundred sixty-three".