21120303444 has 24 divisors (see below), whose sum is σ = 50612620128. Its totient is φ = 6849828000.

The previous prime is 21120303397. The next prime is 21120303469. The reversal of 21120303444 is 44430302112.

It is a super-2 number, since 2×21120303444² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 23783682 + ... + 23784569.

It is an arithmetic number, because the mean of its divisors is an integer number (2108859172).

Almost surely, 2^21120303444 is an apocalyptic number.

It is an amenable number.

21120303444 is an abundant number, since it is smaller than the sum of its proper divisors (29492316684).

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

21120303444 is a wasteful number, since it uses less digits than its factorization.

21120303444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47568295 (or 47568293 counting only the distinct ones).

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

Adding to 21120303444 its reverse (44430302112), we get a palindrome (65550605556).

The spelling of 21120303444 in words is "twenty-one billion, one hundred twenty million, three hundred three thousand, four hundred forty-four".