21302230231 has 4 divisors (see below), whose sum is σ = 21821796864. Its totient is φ = 20782663600.

The previous prime is 21302230219. The next prime is 21302230259. The reversal of 21302230231 is 13203220312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21302230231 is a prime.

It is a super-2 number, since 2×21302230231² (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 = 21302230199 and 21302230208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302230211) 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, 259783255 + ... + 259783336.

It is an arithmetic number, because the mean of its divisors is an integer number (5455449216).

Almost surely, 2^21302230231 is an apocalyptic number.

21302230231 is a deficient number, since it is larger than the sum of its proper divisors (519566633).

21302230231 is an equidigital number, since it uses as much as digits as its factorization.

21302230231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519566632.

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

Adding to 21302230231 its reverse (13203220312), we get a palindrome (34505450543).

It can be divided in two parts, 213022 and 30231, that added together give a triangular number (243253 = T₆₉₇).

The spelling of 21302230231 in words is "twenty-one billion, three hundred two million, two hundred thirty thousand, two hundred thirty-one".