21202330231 has 4 divisors (see below), whose sum is σ = 21238450632. Its totient is φ = 21166209832.

The previous prime is 21202330213. The next prime is 21202330243. The reversal of 21202330231 is 13203320212.

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

It is a cyclic number.

It is not a de Polignac number, because 21202330231 - 2¹³ = 21202322039 is a prime.

It is a super-2 number, since 2×21202330231² (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 = 21202330199 and 21202330208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202330291) 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, 18059320 + ... + 18060493.

It is an arithmetic number, because the mean of its divisors is an integer number (5309612658).

Almost surely, 2^21202330231 is an apocalyptic number.

21202330231 is a deficient number, since it is larger than the sum of its proper divisors (36120401).

21202330231 is an equidigital number, since it uses as much as digits as its factorization.

21202330231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36120400.

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

Adding to 21202330231 its reverse (13203320212), we get a palindrome (34405650443).

The spelling of 21202330231 in words is "twenty-one billion, two hundred two million, three hundred thirty thousand, two hundred thirty-one".