21142344344 has 32 divisors (see below), whose sum is σ = 44414514000. Its totient is φ = 9350421120.

The previous prime is 21142344343. The next prime is 21142344347. The reversal of 21142344344 is 44344324112.

It is a self number, because there is not a number n which added to its sum of digits gives 21142344344.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142344341) 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, 3243419 + ... + 3249930.

Almost surely, 2^21142344344 is an apocalyptic number.

It is an amenable number.

21142344344 is an abundant number, since it is smaller than the sum of its proper divisors (23272169656).

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

21142344344 is a wasteful number, since it uses less digits than its factorization.

21142344344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6493403 (or 6493399 counting only the distinct ones).

The product of its digits is 36864, while the sum is 32.

Adding to 21142344344 its reverse (44344324112), we get a palindrome (65486668456).

The spelling of 21142344344 in words is "twenty-one billion, one hundred forty-two million, three hundred forty-four thousand, three hundred forty-four".