21443434100 has 36 divisors (see below), whose sum is σ = 50762459328. Its totient is φ = 7797612000.

The previous prime is 21443434063. The next prime is 21443434169. The reversal of 21443434100 is 143434412.

It is a self number, because there is not a number n which added to its sum of digits gives 21443434100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9745916 + ... + 9748115.

Almost surely, 2^21443434100 is an apocalyptic number.

21443434100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21443434100 is an abundant number, since it is smaller than the sum of its proper divisors (29319025228).

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

21443434100 is a wasteful number, since it uses less digits than its factorization.

21443434100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19494056 (or 19494049 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21443434100 its reverse (143434412), we get a palindrome (21586868512).

The spelling of 21443434100 in words is "twenty-one billion, four hundred forty-three million, four hundred thirty-four thousand, one hundred".