21344213231 has 8 divisors (see below), whose sum is σ = 23288626128. Its totient is φ = 19400472000.

The previous prime is 21344213183. The next prime is 21344213243. The reversal of 21344213231 is 13231244312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21344213231 is a prime.

It is a super-2 number, since 2×21344213231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21344213231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344210231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100280 + ... + 229661.

It is an arithmetic number, because the mean of its divisors is an integer number (2911078266).

Almost surely, 2^21344213231 is an apocalyptic number.

21344213231 is a deficient number, since it is larger than the sum of its proper divisors (1944412897).

21344213231 is a wasteful number, since it uses less digits than its factorization.

21344213231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335833.

The product of its digits is 3456, while the sum is 26.

Adding to 21344213231 its reverse (13231244312), we get a palindrome (34575457543).

The spelling of 21344213231 in words is "twenty-one billion, three hundred forty-four million, two hundred thirteen thousand, two hundred thirty-one".