21001133232 has 60 divisors (see below), whose sum is σ = 60800706720. Its totient is φ = 6758984064.

The previous prime is 21001133161. The next prime is 21001133233. The reversal of 21001133232 is 23233110012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21001133233) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2510328 + ... + 2518679.

It is an arithmetic number, because the mean of its divisors is an integer number (1013345112).

Almost surely, 2^21001133232 is an apocalyptic number.

It is an amenable number.

21001133232 is an abundant number, since it is smaller than the sum of its proper divisors (39799573488).

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

21001133232 is a wasteful number, since it uses less digits than its factorization.

21001133232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5029050 (or 5029041 counting only the distinct ones).

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

Adding to 21001133232 its reverse (23233110012), we get a palindrome (44234243244).

The spelling of 21001133232 in words is "twenty-one billion, one million, one hundred thirty-three thousand, two hundred thirty-two".