21033221332 has 48 divisors (see below), whose sum is σ = 39202652160. Its totient is φ = 9853395552.

The previous prime is 21033221303. The next prime is 21033221333. The reversal of 21033221332 is 23312233012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033221333) 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, 911643 + ... + 934429.

It is an arithmetic number, because the mean of its divisors is an integer number (816721920).

Almost surely, 2^21033221332 is an apocalyptic number.

It is an amenable number.

21033221332 is a deficient number, since it is larger than the sum of its proper divisors (18169430828).

21033221332 is a wasteful number, since it uses less digits than its factorization.

21033221332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23020 (or 23018 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21033221332 its reverse (23312233012), we get a palindrome (44345454344).

The spelling of 21033221332 in words is "twenty-one billion, thirty-three million, two hundred twenty-one thousand, three hundred thirty-two".