231213030221 has 8 divisors (see below), whose sum is σ = 236539880640. Its totient is φ = 225933112768.

The previous prime is 231213030193. The next prime is 231213030233. The reversal of 231213030221 is 122030312132.

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 231213030221 - 2⁶ = 231213030157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231213030193 and 231213030202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231213033221) 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, 11723276 + ... + 11742981.

It is an arithmetic number, because the mean of its divisors is an integer number (29567485080).

Almost surely, 2^231213030221 is an apocalyptic number.

It is an amenable number.

231213030221 is a deficient number, since it is larger than the sum of its proper divisors (5326850419).

231213030221 is a wasteful number, since it uses less digits than its factorization.

231213030221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23466483.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 231213030221 its reverse (122030312132), we get a palindrome (353243342353).

The spelling of 231213030221 in words is "two hundred thirty-one billion, two hundred thirteen million, thirty thousand, two hundred twenty-one".