21344042132 has 24 divisors (see below), whose sum is σ = 43596344064. Its totient is φ = 8952819552.

The previous prime is 21344042077. The next prime is 21344042149. The reversal of 21344042132 is 23124044312.

It is a super-2 number, since 2×21344042132² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8108123 + ... + 8110754.

It is an arithmetic number, because the mean of its divisors is an integer number (1816514336).

Almost surely, 2^21344042132 is an apocalyptic number.

It is an amenable number.

21344042132 is an abundant number, since it is smaller than the sum of its proper divisors (22252301932).

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

21344042132 is a wasteful number, since it uses less digits than its factorization.

21344042132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16218935 (or 16218933 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21344042132 its reverse (23124044312), we get a palindrome (44468086444).

The spelling of 21344042132 in words is "twenty-one billion, three hundred forty-four million, forty-two thousand, one hundred thirty-two".