2181207 has 8 divisors (see below), whose sum is σ = 3323776. Its totient is φ = 1246392.

The previous prime is 2181203. The next prime is 2181209. The reversal of 2181207 is 7021812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2181207 - 2² = 2181203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 103867 = 2181207 / (2 + 1 + 8 + 1 + 2 + 0 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51913 + ... + 51954.

It is an arithmetic number, because the mean of its divisors is an integer number (415472).

2^2181207 is an apocalyptic number.

2181207 is a deficient number, since it is larger than the sum of its proper divisors (1142569).

2181207 is a wasteful number, since it uses less digits than its factorization.

2181207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103877.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 2181207 is about 1476.8909912380. The cubic root of 2181207 is about 129.6877515938.

The spelling of 2181207 in words is "two million, one hundred eighty-one thousand, two hundred seven".