21002300444 has 6 divisors (see below), whose sum is σ = 36754025784. Its totient is φ = 10501150220.

The previous prime is 21002300441. The next prime is 21002300461. The reversal of 21002300444 is 44400320012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002300441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625287552 + ... + 2625287559.

It is an arithmetic number, because the mean of its divisors is an integer number (6125670964).

Almost surely, 2^21002300444 is an apocalyptic number.

It is an amenable number.

21002300444 is a deficient number, since it is larger than the sum of its proper divisors (15751725340).

21002300444 is a wasteful number, since it uses less digits than its factorization.

21002300444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5250575115 (or 5250575113 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21002300444 its reverse (44400320012), we get a palindrome (65402620456).

The spelling of 21002300444 in words is "twenty-one billion, two million, three hundred thousand, four hundred forty-four".