203121243 has 16 divisors (see below), whose sum is σ = 324068640. Its totient is φ = 124997472.

The previous prime is 203121241. The next prime is 203121283. The reversal of 203121243 is 342121302.

203121243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 203121243 - 2¹ = 203121241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (203121241) 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, 288996 + ... + 289697.

It is an arithmetic number, because the mean of its divisors is an integer number (20254290).

Almost surely, 2^203121243 is an apocalyptic number.

203121243 is a deficient number, since it is larger than the sum of its proper divisors (120947397).

203121243 is a wasteful number, since it uses less digits than its factorization.

203121243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578715 (or 578709 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 203121243 is about 14252.0610088506. The cubic root of 203121243 is about 587.8300477173.

Adding to 203121243 its reverse (342121302), we get a palindrome (545242545).

The spelling of 203121243 in words is "two hundred three million, one hundred twenty-one thousand, two hundred forty-three".