21044354264 has 64 divisors (see below), whose sum is σ = 42620256000. Its totient is φ = 9704341504.

The previous prime is 21044354251. The next prime is 21044354297. The reversal of 21044354264 is 46245344012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8770937 + ... + 8773335.

It is an arithmetic number, because the mean of its divisors is an integer number (665941500).

Almost surely, 2^21044354264 is an apocalyptic number.

It is an amenable number.

21044354264 is an abundant number, since it is smaller than the sum of its proper divisors (21575901736).

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

21044354264 is a wasteful number, since it uses less digits than its factorization.

21044354264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3692 (or 3688 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 35.

Adding to 21044354264 its reverse (46245344012), we get a palindrome (67289698276).

The spelling of 21044354264 in words is "twenty-one billion, forty-four million, three hundred fifty-four thousand, two hundred sixty-four".