21433232100 has 216 divisors, whose sum is σ = 72464528640. Its totient is φ = 4876865280.

The previous prime is 21433232063. The next prime is 21433232123. The reversal of 21433232100 is 123233412.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3363117 + ... + 3369483.

Almost surely, 2^21433232100 is an apocalyptic number.

21433232100 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 21433232100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36232264320).

21433232100 is an abundant number, since it is smaller than the sum of its proper divisors (51031296540).

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

21433232100 is a wasteful number, since it uses less digits than its factorization.

21433232100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6627 (or 6613 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21433232100 its reverse (123233412), we get a palindrome (21556465512).

The spelling of 21433232100 in words is "twenty-one billion, four hundred thirty-three million, two hundred thirty-two thousand, one hundred".