231303210221 has 16 divisors (see below), whose sum is σ = 233531424000. Its totient is φ = 229086533760.

The previous prime is 231303210217. The next prime is 231303210227. The reversal of 231303210221 is 122012303132.

It is a cyclic number.

It is not a de Polignac number, because 231303210221 - 2² = 231303210217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231303210193 and 231303210202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231303210227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77125280 + ... + 77128278.

It is an arithmetic number, because the mean of its divisors is an integer number (14595714000).

Almost surely, 2^231303210221 is an apocalyptic number.

It is an amenable number.

231303210221 is a deficient number, since it is larger than the sum of its proper divisors (2228213779).

231303210221 is a wasteful number, since it uses less digits than its factorization.

231303210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4684.

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

Adding to 231303210221 its reverse (122012303132), we get a palindrome (353315513353).

The spelling of 231303210221 in words is "two hundred thirty-one billion, three hundred three million, two hundred ten thousand, two hundred twenty-one".