2157201 has 6 divisors (see below), whose sum is σ = 3115970. Its totient is φ = 1438128.

The previous prime is 2157187. The next prime is 2157209. The reversal of 2157201 is 1027512.

It can be written as a sum of positive squares in only one way, i.e., 2099601 + 57600 = 1449^2 + 240^2 .

It is not a de Polignac number, because 2157201 - 2¹⁸ = 1895057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2157209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119836 + ... + 119853.

2^2157201 is an apocalyptic number.

It is an amenable number.

2157201 is a deficient number, since it is larger than the sum of its proper divisors (958769).

2157201 is a wasteful number, since it uses less digits than its factorization.

2157201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239695 (or 239692 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 2157201 is about 1468.7412978466. The cubic root of 2157201 is about 129.2102215009.

The spelling of 2157201 in words is "two million, one hundred fifty-seven thousand, two hundred one".