21210443100 has 432 divisors, whose sum is σ = 83199008256. Its totient is φ = 4390848000.

The previous prime is 21210443069. The next prime is 21210443123. The reversal of 21210443100 is 134401212.

21210443100 is a `hidden beast` number, since 2 + 1 + 210 + 443 + 10 + 0 = 666.

It is a super-2 number, since 2×21210443100² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 29174937 + ... + 29175663.

Almost surely, 2^21210443100 is an apocalyptic number.

21210443100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210443100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41599504128).

21210443100 is an abundant number, since it is smaller than the sum of its proper divisors (61988565156).

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

21210443100 is a wasteful number, since it uses less digits than its factorization.

21210443100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186 (or 1176 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21210443100 its reverse (134401212), we get a palindrome (21344844312).

The spelling of 21210443100 in words is "twenty-one billion, two hundred ten million, four hundred forty-three thousand, one hundred".