21433321100 has 54 divisors (see below), whose sum is σ = 46977600012. Its totient is φ = 8488040000.

The previous prime is 21433321099. The next prime is 21433321153. The reversal of 21433321100 is 112333412.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1009595 + ... + 1030605.

Almost surely, 2^21433321100 is an apocalyptic number.

21433321100 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 21433321100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23488800006).

21433321100 is an abundant number, since it is smaller than the sum of its proper divisors (25544278912).

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

21433321100 is a wasteful number, since it uses less digits than its factorization.

21433321100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21227 (or 21119 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21433321100 its reverse (112333412), we get a palindrome (21545654512).

The spelling of 21433321100 in words is "twenty-one billion, four hundred thirty-three million, three hundred twenty-one thousand, one hundred".