21033132221 has 8 divisors (see below), whose sum is σ = 22738522080. Its totient is φ = 19387580688.

The previous prime is 21033132199. The next prime is 21033132233. The reversal of 21033132221 is 12223133012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21033132221 - 2¹⁸ = 21032870077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21033132193 and 21033132202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033102221) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 14958851 + ... + 14960256.

It is an arithmetic number, because the mean of its divisors is an integer number (2842315260).

Almost surely, 2^21033132221 is an apocalyptic number.

It is an amenable number.

21033132221 is a deficient number, since it is larger than the sum of its proper divisors (1705389859).

21033132221 is a wasteful number, since it uses less digits than its factorization.

21033132221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29919163.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21033132221 its reverse (12223133012), we get a palindrome (33256265233).

The spelling of 21033132221 in words is "twenty-one billion, thirty-three million, one hundred thirty-two thousand, two hundred twenty-one".