21343121344 has 28 divisors (see below), whose sum is σ = 44581851400. Its totient is φ = 10109899008.

The previous prime is 21343121341. The next prime is 21343121369. The reversal of 21343121344 is 44312134312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343121341) 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, 8774739 + ... + 8777170.

Almost surely, 2^21343121344 is an apocalyptic number.

It is an amenable number.

21343121344 is an abundant number, since it is smaller than the sum of its proper divisors (23238730056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21343121344 is a wasteful number, since it uses less digits than its factorization.

21343121344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17551940 (or 17551930 counting only the distinct ones).

The product of its digits is 6912, while the sum is 28.

Adding to 21343121344 its reverse (44312134312), we get a palindrome (65655255656).

The spelling of 21343121344 in words is "twenty-one billion, three hundred forty-three million, one hundred twenty-one thousand, three hundred forty-four".