21243411100 has 18 divisors (see below), whose sum is σ = 46098202304. Its totient is φ = 8497364400.

The previous prime is 21243411097. The next prime is 21243411109. The reversal of 21243411100 is 111434212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243411109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106216956 + ... + 106217155.

Almost surely, 2^21243411100 is an apocalyptic number.

21243411100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21243411100 is an abundant number, since it is smaller than the sum of its proper divisors (24854791204).

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

21243411100 is a wasteful number, since it uses less digits than its factorization.

21243411100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212434125 (or 212434118 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21243411100 its reverse (111434212), we get a palindrome (21354845312).

The spelling of 21243411100 in words is "twenty-one billion, two hundred forty-three million, four hundred eleven thousand, one hundred".