21120303044 has 12 divisors (see below), whose sum is σ = 36963811500. Its totient is φ = 10559214048.

The previous prime is 21120303041. The next prime is 21120303079. The reversal of 21120303044 is 44030302112.

It can be written as a sum of positive squares in 2 ways, for example, as 16535388100 + 4584914944 = 128590^2 + 67712^2 .

It is not an unprimeable number, because it can be changed into a prime (21120303041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182399 + ... + 274790.

It is an arithmetic number, because the mean of its divisors is an integer number (3080317625).

Almost surely, 2^21120303044 is an apocalyptic number.

It is an amenable number.

21120303044 is a deficient number, since it is larger than the sum of its proper divisors (15843508456).

21120303044 is a wasteful number, since it uses less digits than its factorization.

21120303044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468742 (or 468740 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21120303044 its reverse (44030302112), we get a palindrome (65150605156).

The spelling of 21120303044 in words is "twenty-one billion, one hundred twenty million, three hundred three thousand, forty-four".