2121271890 has 64 divisors (see below), whose sum is σ = 5162572800. Its totient is φ = 557777664.

The previous prime is 2121271879. The next prime is 2121271921. The reversal of 2121271890 is 981721212.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 727756 + ... + 730664.

It is an arithmetic number, because the mean of its divisors is an integer number (80665200).

Almost surely, 2^2121271890 is an apocalyptic number.

2121271890 is an abundant number, since it is smaller than the sum of its proper divisors (3041300910).

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

2121271890 is a wasteful number, since it uses less digits than its factorization.

2121271890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3251.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 2121271890 is about 46057.2675047055. The cubic root of 2121271890 is about 1284.8885104663. Note that the first 3 decimals are identical.

The spelling of 2121271890 in words is "two billion, one hundred twenty-one million, two hundred seventy-one thousand, eight hundred ninety".