21322421432231 has 4 divisors (see below), whose sum is σ = 22010241478464. Its totient is φ = 20634601386000.

The previous prime is 21322421432219. The next prime is 21322421432287. The reversal of 21322421432231 is 13223412422312.

It is a happy number.

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 21322421432231 - 2³⁸ = 21047543525287 is a prime.

It is a super-2 number, since 2×21322421432231² (a number of 27 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 (21322421431231) 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, 343910023070 + ... + 343910023131.

It is an arithmetic number, because the mean of its divisors is an integer number (5502560369616).

Almost surely, 2^{21322421432231} is an apocalyptic number.

21322421432231 is a deficient number, since it is larger than the sum of its proper divisors (687820046233).

21322421432231 is an equidigital number, since it uses as much as digits as its factorization.

21322421432231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687820046232.

The product of its digits is 27648, while the sum is 32.

Adding to 21322421432231 its reverse (13223412422312), we get a palindrome (34545833854543).

The spelling of 21322421432231 in words is "twenty-one trillion, three hundred twenty-two billion, four hundred twenty-one million, four hundred thirty-two thousand, two hundred thirty-one".