21302010444 has 96 divisors (see below), whose sum is σ = 59972726016. Its totient is φ = 5797543680.

The previous prime is 21302010439. The next prime is 21302010449. The reversal of 21302010444 is 44401020312.

It is an interprime number because it is at equal distance from previous prime (21302010439) and next prime (21302010449).

It is a self number, because there is not a number n which added to its sum of digits gives 21302010444.

It is not an unprimeable number, because it can be changed into a prime (21302010449) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104262 + ... + 231245.

It is an arithmetic number, because the mean of its divisors is an integer number (624715896).

Almost surely, 2^21302010444 is an apocalyptic number.

It is an amenable number.

21302010444 is an abundant number, since it is smaller than the sum of its proper divisors (38670715572).

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

21302010444 is a wasteful number, since it uses less digits than its factorization.

21302010444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335575 (or 335573 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21302010444 its reverse (44401020312), we get a palindrome (65703030756).

The spelling of 21302010444 in words is "twenty-one billion, three hundred two million, ten thousand, four hundred forty-four".