21133033100 has 72 divisors (see below), whose sum is σ = 48378570240. Its totient is φ = 7990678080.

The previous prime is 21133033099. The next prime is 21133033111. The reversal of 21133033100 is 133033112.

It is a super-2 number, since 2×21133033100² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 867689 + ... + 891711.

Almost surely, 2^21133033100 is an apocalyptic number.

21133033100 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 21133033100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24189285120).

21133033100 is an abundant number, since it is smaller than the sum of its proper divisors (27245537140).

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

21133033100 is a wasteful number, since it uses less digits than its factorization.

21133033100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24519 (or 24512 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 21133033100 its reverse (133033112), we get a palindrome (21266066212).

The spelling of 21133033100 in words is "twenty-one billion, one hundred thirty-three million, thirty-three thousand, one hundred".