1221233876 has 24 divisors (see below), whose sum is σ = 2157296064. Its totient is φ = 604880640.

The previous prime is 1221233869. The next prime is 1221233917. The reversal of 1221233876 is 6783321221.

It is a congruent number.

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, 350921 + ... + 354383.

It is an arithmetic number, because the mean of its divisors is an integer number (89887336).

Almost surely, 2^1221233876 is an apocalyptic number.

It is an amenable number.

1221233876 is a deficient number, since it is larger than the sum of its proper divisors (936062188).

1221233876 is a wasteful number, since it uses less digits than its factorization.

1221233876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4271 (or 4269 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 1221233876 is about 34946.1568130174. The cubic root of 1221233876 is about 1068.8898364228.

The spelling of 1221233876 in words is "one billion, two hundred twenty-one million, two hundred thirty-three thousand, eight hundred seventy-six".