2121996 has 48 divisors (see below), whose sum is σ = 5362560. Its totient is φ = 650880.

The previous prime is 2121989. The next prime is 2122009. The reversal of 2121996 is 6991212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9235 + ... + 9461.

It is an arithmetic number, because the mean of its divisors is an integer number (111720).

2^2121996 is an apocalyptic number.

2121996 is the 779-th nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2121996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2681280).

2121996 is an abundant number, since it is smaller than the sum of its proper divisors (3240564).

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

2121996 is a wasteful number, since it uses less digits than its factorization.

2121996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 292 counting only the distinct ones).

The product of its digits is 1944, while the sum is 30.

The square root of 2121996 is about 1456.7072458116. The cubic root of 2121996 is about 128.5034695526.

The spelling of 2121996 in words is "two million, one hundred twenty-one thousand, nine hundred ninety-six".