231024242221 has 4 divisors (see below), whose sum is σ = 231046636444. Its totient is φ = 231001848000.

The previous prime is 231024242203. The next prime is 231024242237. The reversal of 231024242221 is 122242420132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85854860100 + 145169382121 = 293010^2 + 381011^2 .

It is a cyclic number.

It is not a de Polignac number, because 231024242221 - 2⁷ = 231024242093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231024242291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11181630 + ... + 11202271.

It is an arithmetic number, because the mean of its divisors is an integer number (57761659111).

Almost surely, 2^231024242221 is an apocalyptic number.

It is an amenable number.

231024242221 is a deficient number, since it is larger than the sum of its proper divisors (22394223).

231024242221 is a wasteful number, since it uses less digits than its factorization.

231024242221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22394222.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 231024242221 its reverse (122242420132), we get a palindrome (353266662353).

The spelling of 231024242221 in words is "two hundred thirty-one billion, twenty-four million, two hundred forty-two thousand, two hundred twenty-one".