21021233332 has 48 divisors (see below), whose sum is σ = 41286091392. Its totient is φ = 9283697280.

The previous prime is 21021233291. The next prime is 21021233371. The reversal of 21021233332 is 23333212012.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196438 + ... + 283954.

It is an arithmetic number, because the mean of its divisors is an integer number (860126904).

Almost surely, 2^21021233332 is an apocalyptic number.

21021233332 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21021233332 is a deficient number, since it is larger than the sum of its proper divisors (20264858060).

21021233332 is a wasteful number, since it uses less digits than its factorization.

21021233332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87688 (or 87686 counting only the distinct ones).

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

Adding to 21021233332 its reverse (23333212012), we get a palindrome (44354445344).

The spelling of 21021233332 in words is "twenty-one billion, twenty-one million, two hundred thirty-three thousand, three hundred thirty-two".