21235315044 has 48 divisors (see below), whose sum is σ = 50264686080. Its totient is φ = 6976838400.

The previous prime is 21235315007. The next prime is 21235315051. The reversal of 21235315044 is 44051353212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 230992 + ... + 309560.

It is an arithmetic number, because the mean of its divisors is an integer number (1047180960).

Almost surely, 2^21235315044 is an apocalyptic number.

It is an amenable number.

21235315044 is an abundant number, since it is smaller than the sum of its proper divisors (29029371036).

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

21235315044 is a wasteful number, since it uses less digits than its factorization.

21235315044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78900 (or 78898 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21235315044 its reverse (44051353212), we get a palindrome (65286668256).

The spelling of 21235315044 in words is "twenty-one billion, two hundred thirty-five million, three hundred fifteen thousand, forty-four".