2157229 has 2 divisors, whose sum is σ = 2157230. Its totient is φ = 2157228.

The previous prime is 2157209. The next prime is 2157247. The reversal of 2157229 is 9227512.

2157229 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1102500 + 1054729 = 1050^2 + 1027^2 .

It is a cyclic number.

It is not a de Polignac number, because 2157229 - 2¹⁹ = 1632941 is a prime.

2157229 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2157197 and 2157206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2157209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078614 + 1078615.

It is an arithmetic number, because the mean of its divisors is an integer number (1078615).

2^2157229 is an apocalyptic number.

It is an amenable number.

2157229 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157229 is an equidigital number, since it uses as much as digits as its factorization.

2157229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 28.

The square root of 2157229 is about 1468.7508297870. The cubic root of 2157229 is about 129.2107805386.

The spelling of 2157229 in words is "two million, one hundred fifty-seven thousand, two hundred twenty-nine".