21234041323516 has 24 divisors (see below), whose sum is σ = 42474913955936. Its totient is φ = 9098839572480.

The previous prime is 21234041323513. The next prime is 21234041323577. The reversal of 21234041323516 is 61532314043212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234041323513) 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, 60816645 + ... + 61164796.

Almost surely, 2^{21234041323516} is an apocalyptic number.

It is an amenable number.

21234041323516 is an abundant number, since it is smaller than the sum of its proper divisors (21240872632420).

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

21234041323516 is a wasteful number, since it uses less digits than its factorization.

21234041323516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121987669 (or 121987667 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

Adding to 21234041323516 its reverse (61532314043212), we get a palindrome (82766355366728).

The spelling of 21234041323516 in words is "twenty-one trillion, two hundred thirty-four billion, forty-one million, three hundred twenty-three thousand, five hundred sixteen".