1220121868 has 24 divisors (see below), whose sum is σ = 2444656032. Its totient is φ = 521963904.

The previous prime is 1220121857. The next prime is 1220121883. The reversal of 1220121868 is 8681210221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23521 + ... + 54712.

It is an arithmetic number, because the mean of its divisors is an integer number (101860668).

Almost surely, 2^1220121868 is an apocalyptic number.

It is an amenable number.

1220121868 is an abundant number, since it is smaller than the sum of its proper divisors (1224534164).

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

1220121868 is a wasteful number, since it uses less digits than its factorization.

1220121868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78801 (or 78799 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 1220121868 is about 34930.2428849271. The cubic root of 1220121868 is about 1068.5653080848.

The spelling of 1220121868 in words is "one billion, two hundred twenty million, one hundred twenty-one thousand, eight hundred sixty-eight".