21344430311 has 8 divisors (see below), whose sum is σ = 22470913920. Its totient is φ = 20218255992.

The previous prime is 21344430277. The next prime is 21344430323. The reversal of 21344430311 is 11303444312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21344430311 - 2²² = 21340236007 is a prime.

It is a super-2 number, since 2×21344430311² (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 (21344430011) 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, 71726 + ... + 218708.

It is an arithmetic number, because the mean of its divisors is an integer number (2808864240).

Almost surely, 2^21344430311 is an apocalyptic number.

21344430311 is a deficient number, since it is larger than the sum of its proper divisors (1126483609).

21344430311 is a wasteful number, since it uses less digits than its factorization.

21344430311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154645.

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

Adding to 21344430311 its reverse (11303444312), we get a palindrome (32647874623).

The spelling of 21344430311 in words is "twenty-one billion, three hundred forty-four million, four hundred thirty thousand, three hundred eleven".