2121223208 has 32 divisors (see below), whose sum is σ = 4469472000. Its totient is φ = 936458688.

The previous prime is 2121223207. The next prime is 2121223219. The reversal of 2121223208 is 8023221212.

It is a super-2 number, since 2×2121223208² = 8999175796315622528, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (2121223201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 441008 + ... + 445791.

It is an arithmetic number, because the mean of its divisors is an integer number (139671000).

Almost surely, 2^2121223208 is an apocalyptic number.

It is an amenable number.

2121223208 is an abundant number, since it is smaller than the sum of its proper divisors (2348248792).

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

2121223208 is a wasteful number, since it uses less digits than its factorization.

2121223208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 886841 (or 886837 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 2121223208 is about 46056.7390074460. The cubic root of 2121223208 is about 1284.8786812342.

The spelling of 2121223208 in words is "two billion, one hundred twenty-one million, two hundred twenty-three thousand, two hundred eight".