21230422231 has 4 divisors (see below), whose sum is σ = 21291605352. Its totient is φ = 21169239112.

The previous prime is 21230422211. The next prime is 21230422253. The reversal of 21230422231 is 13222403212.

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-21230422231 is a prime.

It is a super-2 number, since 2×21230422231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230422211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30591040 + ... + 30591733.

It is an arithmetic number, because the mean of its divisors is an integer number (5322901338).

Almost surely, 2^21230422231 is an apocalyptic number.

21230422231 is a deficient number, since it is larger than the sum of its proper divisors (61183121).

21230422231 is an equidigital number, since it uses as much as digits as its factorization.

21230422231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61183120.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21230422231 its reverse (13222403212), we get a palindrome (34452825443).

The spelling of 21230422231 in words is "twenty-one billion, two hundred thirty million, four hundred twenty-two thousand, two hundred thirty-one".