21004133232 has 80 divisors (see below), whose sum is σ = 57203838720. Its totient is φ = 6627895296.

The previous prime is 21004133221. The next prime is 21004133237. The reversal of 21004133232 is 23233140012.

It is a super-2 number, since 2×21004133232² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21004133199 and 21004133208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004133237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9019 + ... + 205157.

It is an arithmetic number, because the mean of its divisors is an integer number (715047984).

Almost surely, 2^21004133232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21004133232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28601919360).

21004133232 is an abundant number, since it is smaller than the sum of its proper divisors (36199705488).

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

21004133232 is a wasteful number, since it uses less digits than its factorization.

21004133232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196270 (or 196264 counting only the distinct ones).

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

Adding to 21004133232 its reverse (23233140012), we get a palindrome (44237273244).

The spelling of 21004133232 in words is "twenty-one billion, four million, one hundred thirty-three thousand, two hundred thirty-two".