21320230231 has 8 divisors (see below), whose sum is σ = 21719814704. Its totient is φ = 20922261120.

The previous prime is 21320230223. The next prime is 21320230271. The reversal of 21320230231 is 13203202312.

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 21320230231 - 2³ = 21320230223 is a prime.

It is a super-2 number, since 2×21320230231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21320230199 and 21320230208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320230271) 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, 377181 + ... + 430006.

It is an arithmetic number, because the mean of its divisors is an integer number (2714976838).

Almost surely, 2^21320230231 is an apocalyptic number.

21320230231 is a deficient number, since it is larger than the sum of its proper divisors (399584473).

21320230231 is an equidigital number, since it uses as much as digits as its factorization.

21320230231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807681.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21320230231 its reverse (13203202312), we get a palindrome (34523432543).

The spelling of 21320230231 in words is "twenty-one billion, three hundred twenty million, two hundred thirty thousand, two hundred thirty-one".