231041721 has 8 divisors (see below), whose sum is σ = 310782240. Its totient is φ = 152664512.

The previous prime is 231041689. The next prime is 231041731. The reversal of 231041721 is 127140132.

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

It is a cyclic number.

It is not a de Polignac number, because 231041721 - 2⁵ = 231041689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231041731) 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, 340431 + ... + 341108.

It is an arithmetic number, because the mean of its divisors is an integer number (38847780).

Almost surely, 2^231041721 is an apocalyptic number.

It is an amenable number.

231041721 is a deficient number, since it is larger than the sum of its proper divisors (79740519).

231041721 is a wasteful number, since it uses less digits than its factorization.

231041721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681655.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 231041721 is about 15200.0566117367. The cubic root of 231041721 is about 613.6161813380.

Adding to 231041721 its reverse (127140132), we get a palindrome (358181853).

The spelling of 231041721 in words is "two hundred thirty-one million, forty-one thousand, seven hundred twenty-one".