1221673268 has 6 divisors (see below), whose sum is σ = 2137928226. Its totient is φ = 610836632.

The previous prime is 1221673253. The next prime is 1221673273. The reversal of 1221673268 is 8623761221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 898680484 + 322992784 = 29978^2 + 17972^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 152709155 + ... + 152709162.

It is an arithmetic number, because the mean of its divisors is an integer number (356321371).

Almost surely, 2^1221673268 is an apocalyptic number.

It is an amenable number.

1221673268 is a deficient number, since it is larger than the sum of its proper divisors (916254958).

1221673268 is a wasteful number, since it uses less digits than its factorization.

1221673268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305418321 (or 305418319 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 1221673268 is about 34952.4429475251. The cubic root of 1221673268 is about 1069.0180142536.

It can be divided in two parts, 1221 and 673268, that multiplied together give a palindrome (822060228).

The spelling of 1221673268 in words is "one billion, two hundred twenty-one million, six hundred seventy-three thousand, two hundred sixty-eight".