21344220231 has 8 divisors (see below), whose sum is σ = 28462410480. Its totient is φ = 14227755072.

The previous prime is 21344220203. The next prime is 21344220241. The reversal of 21344220231 is 13202244312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21344220231 - 2⁶ = 21344220167 is a prime.

It is a super-2 number, since 2×21344220231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344220241) 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 7 ways as a sum of consecutive naturals, for example, 402120 + ... + 452093.

It is an arithmetic number, because the mean of its divisors is an integer number (3557801310).

Almost surely, 2^21344220231 is an apocalyptic number.

21344220231 is a deficient number, since it is larger than the sum of its proper divisors (7118190249).

21344220231 is an equidigital number, since it uses as much as digits as its factorization.

21344220231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862545.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21344220231 its reverse (13202244312), we get a palindrome (34546464543).

The spelling of 21344220231 in words is "twenty-one billion, three hundred forty-four million, two hundred twenty thousand, two hundred thirty-one".