21443035512 has 32 divisors (see below), whose sum is σ = 53879720400. Its totient is φ = 7111394304.

The previous prime is 21443035499. The next prime is 21443035517. The reversal of 21443035512 is 21553034412.

It is a self number, because there is not a number n which added to its sum of digits gives 21443035512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21443035517) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2262937 + ... + 2272392.

Almost surely, 2^21443035512 is an apocalyptic number.

It is an amenable number.

21443035512 is an abundant number, since it is smaller than the sum of its proper divisors (32436684888).

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

21443035512 is a wasteful number, since it uses less digits than its factorization.

21443035512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4535535 (or 4535531 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21443035512 its reverse (21553034412), we get a palindrome (42996069924).

It can be divided in two parts, 214430 and 35512, that added together give a palindrome (249942).

The spelling of 21443035512 in words is "twenty-one billion, four hundred forty-three million, thirty-five thousand, five hundred twelve".