21033220032 has 84 divisors (see below), whose sum is σ = 65768668056. Its totient is φ = 6373701120.

The previous prime is 21033220009. The next prime is 21033220051. The reversal of 21033220032 is 23002233012.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21033219987 and 21033220014.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1653483 + ... + 1666154.

It is an arithmetic number, because the mean of its divisors is an integer number (782960334).

Almost surely, 2^21033220032 is an apocalyptic number.

21033220032 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21033220032 is an abundant number, since it is smaller than the sum of its proper divisors (44735448024).

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

21033220032 is a wasteful number, since it uses less digits than its factorization.

21033220032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3319666 (or 3319653 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

Adding to 21033220032 its reverse (23002233012), we get a palindrome (44035453044).

The spelling of 21033220032 in words is "twenty-one billion, thirty-three million, two hundred twenty thousand, thirty-two".