1221287268 has 48 divisors (see below), whose sum is σ = 2981966400. Its totient is φ = 388612224.

The previous prime is 1221287239. The next prime is 1221287273. The reversal of 1221287268 is 8627821221.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2418 + ... + 49481.

It is an arithmetic number, because the mean of its divisors is an integer number (62124300).

Almost surely, 2^1221287268 is an apocalyptic number.

It is an amenable number.

1221287268 is an abundant number, since it is smaller than the sum of its proper divisors (1760679132).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221287268 is a wasteful number, since it uses less digits than its factorization.

1221287268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51996 (or 51994 counting only the distinct ones).

The product of its digits is 43008, while the sum is 39.

The square root of 1221287268 is about 34946.9207227189. The cubic root of 1221287268 is about 1068.9054133830.

The spelling of 1221287268 in words is "one billion, two hundred twenty-one million, two hundred eighty-seven thousand, two hundred sixty-eight".