21231034044 has 48 divisors (see below), whose sum is σ = 55062322560. Its totient is φ = 6312255040.

The previous prime is 21231034039. The next prime is 21231034087. The reversal of 21231034044 is 44043013212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1510374 + ... + 1524365.

It is an arithmetic number, because the mean of its divisors is an integer number (1147131720).

Almost surely, 2^21231034044 is an apocalyptic number.

It is an amenable number.

21231034044 is an abundant number, since it is smaller than the sum of its proper divisors (33831288516).

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

21231034044 is a wasteful number, since it uses less digits than its factorization.

21231034044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3034810 (or 3034808 counting only the distinct ones).

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

Adding to 21231034044 its reverse (44043013212), we get a palindrome (65274047256).

The spelling of 21231034044 in words is "twenty-one billion, two hundred thirty-one million, thirty-four thousand, forty-four".