21233123100 has 432 divisors, whose sum is σ = 77896972608. Its totient is φ = 4737761280.

The previous prime is 21233123057. The next prime is 21233123101. The reversal of 21233123100 is 132133212.

21233123100 is a `hidden beast` number, since 21 + 2 + 331 + 2 + 310 + 0 = 666.

It is a super-2 number, since 2×21233123100² (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 not an unprimeable number, because it can be changed into a prime (21233123101) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 63006132 + ... + 63006468.

Almost surely, 2^21233123100 is an apocalyptic number.

21233123100 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 21233123100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38948486304).

21233123100 is an abundant number, since it is smaller than the sum of its proper divisors (56663849508).

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

21233123100 is a wasteful number, since it uses less digits than its factorization.

21233123100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574 (or 564 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21233123100 its reverse (132133212), we get a palindrome (21365256312).

The spelling of 21233123100 in words is "twenty-one billion, two hundred thirty-three million, one hundred twenty-three thousand, one hundred".