231231213320221 has 8 divisors (see below), whose sum is σ = 243401716488320. Its totient is φ = 219060754083072.

The previous prime is 231231213320201. The next prime is 231231213320231. The reversal of 231231213320221 is 122023312132132.

231231213320221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 231231213320221 - 2⁴⁵ = 196046841231389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231231213320221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231231213320201) 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, 108541 + ... + 21505213.

It is an arithmetic number, because the mean of its divisors is an integer number (30425214561040).

Almost surely, 2^{231231213320221} is an apocalyptic number.

It is an amenable number.

231231213320221 is a deficient number, since it is larger than the sum of its proper divisors (12170503168099).

231231213320221 is a wasteful number, since it uses less digits than its factorization.

231231213320221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21965475.

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 231231213320221 its reverse (122023312132132), we get a palindrome (353254525452353).

The spelling of 231231213320221 in words is "two hundred thirty-one trillion, two hundred thirty-one billion, two hundred thirteen million, three hundred twenty thousand, two hundred twenty-one".