21232013244 has 24 divisors (see below), whose sum is σ = 53352238800. Its totient is φ = 6532927104.

The previous prime is 21232013191. The next prime is 21232013273. The reversal of 21232013244 is 44231023212.

It is a happy number.

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, 68051169 + ... + 68051480.

It is an arithmetic number, because the mean of its divisors is an integer number (2223009950).

Almost surely, 2^21232013244 is an apocalyptic number.

It is an amenable number.

21232013244 is an abundant number, since it is smaller than the sum of its proper divisors (32120225556).

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

21232013244 is a wasteful number, since it uses less digits than its factorization.

21232013244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136102669 (or 136102667 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21232013244 its reverse (44231023212), we get a palindrome (65463036456).

The spelling of 21232013244 in words is "twenty-one billion, two hundred thirty-two million, thirteen thousand, two hundred forty-four".