2121801 has 16 divisors (see below), whose sum is σ = 3119040. Its totient is φ = 1272320.

The previous prime is 2121797. The next prime is 2121803. The reversal of 2121801 is 1081212.

It is a cyclic number.

It is not a de Polignac number, because 2121801 - 2² = 2121797 is a prime.

2121801 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2121803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3445 + ... + 4013.

It is an arithmetic number, because the mean of its divisors is an integer number (194940).

2^2121801 is an apocalyptic number.

It is an amenable number.

2121801 is a deficient number, since it is larger than the sum of its proper divisors (997239).

2121801 is a wasteful number, since it uses less digits than its factorization.

2121801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 2121801 is about 1456.6403125000. The cubic root of 2121801 is about 128.4995331732.

The spelling of 2121801 in words is "two million, one hundred twenty-one thousand, eight hundred one".