231310220321 has 4 divisors (see below), whose sum is σ = 231311742144. Its totient is φ = 231308698500.

The previous prime is 231310220291. The next prime is 231310220371. The reversal of 231310220321 is 123022013132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231310220321 - 2¹⁰ = 231310219297 is a prime.

It is a super-2 number, since 2×231310220321² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231310220293 and 231310220302.

It is not an unprimeable number, because it can be changed into a prime (231310220371) 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, 504005 + ... + 846546.

It is an arithmetic number, because the mean of its divisors is an integer number (57827935536).

Almost surely, 2^231310220321 is an apocalyptic number.

It is an amenable number.

231310220321 is a deficient number, since it is larger than the sum of its proper divisors (1521823).

231310220321 is a wasteful number, since it uses less digits than its factorization.

231310220321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521822.

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

Adding to 231310220321 its reverse (123022013132), we get a palindrome (354332233453).

The spelling of 231310220321 in words is "two hundred thirty-one billion, three hundred ten million, two hundred twenty thousand, three hundred twenty-one".