2121217328 has 20 divisors (see below), whose sum is σ = 4210100328. Its totient is φ = 1034739840.

The previous prime is 2121217309. The next prime is 2121217331. The reversal of 2121217328 is 8237121212.

It is a self number, because there is not a number n which added to its sum of digits gives 2121217328.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1616126 + ... + 1617437.

Almost surely, 2^2121217328 is an apocalyptic number.

It is an amenable number.

2121217328 is a deficient number, since it is larger than the sum of its proper divisors (2088883000).

2121217328 is a wasteful number, since it uses less digits than its factorization.

2121217328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3233612 (or 3233606 counting only the distinct ones).

The product of its digits is 2688, while the sum is 29.

The square root of 2121217328 is about 46056.6751730952. The cubic root of 2121217328 is about 1284.8774940114.

The spelling of 2121217328 in words is "two billion, one hundred twenty-one million, two hundred seventeen thousand, three hundred twenty-eight".