231221043 has 12 divisors (see below), whose sum is σ = 334999288. Its totient is φ = 153679680.

The previous prime is 231221009. The next prime is 231221069. The reversal of 231221043 is 340122132.

231221043 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 231221043 - 2¹⁰ = 231220019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231221083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35830 + ... + 41787.

Almost surely, 2^231221043 is an apocalyptic number.

231221043 is a deficient number, since it is larger than the sum of its proper divisors (103778245).

231221043 is a wasteful number, since it uses less digits than its factorization.

231221043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77954 (or 77951 counting only the distinct ones).

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

The square root of 231221043 is about 15205.9541956432. The cubic root of 231221043 is about 613.7748921038.

Adding to 231221043 its reverse (340122132), we get a palindrome (571343175).

The spelling of 231221043 in words is "two hundred thirty-one million, two hundred twenty-one thousand, forty-three".