215403201 has 24 divisors (see below), whose sum is σ = 335822760. Its totient is φ = 132258816.

The previous prime is 215403197. The next prime is 215403203. The reversal of 215403201 is 102304512.

215403201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 18225 + 215384976 = 135^2 + 14676^2 .

It is not a de Polignac number, because 215403201 - 2² = 215403197 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215403203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57745 + ... + 61361.

It is an arithmetic number, because the mean of its divisors is an integer number (13992615).

Almost surely, 2^215403201 is an apocalyptic number.

It is an amenable number.

215403201 is a deficient number, since it is larger than the sum of its proper divisors (120419559).

215403201 is a wasteful number, since it uses less digits than its factorization.

215403201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4145 (or 4142 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 215403201 is about 14676.6208985584. The cubic root of 215403201 is about 599.4468986214.

Adding to 215403201 its reverse (102304512), we get a palindrome (317707713).

The spelling of 215403201 in words is "two hundred fifteen million, four hundred three thousand, two hundred one".