21330133221 has 8 divisors (see below), whose sum is σ = 28440852480. Its totient is φ = 14219751392.

The previous prime is 21330133213. The next prime is 21330133241. The reversal of 21330133221 is 12233103312.

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 21330133221 - 2³ = 21330133213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330133241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202396 + ... + 289178.

It is an arithmetic number, because the mean of its divisors is an integer number (3555106560).

Almost surely, 2^21330133221 is an apocalyptic number.

It is an amenable number.

21330133221 is a deficient number, since it is larger than the sum of its proper divisors (7110719259).

21330133221 is an equidigital number, since it uses as much as digits as its factorization.

21330133221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168715.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21330133221 its reverse (12233103312), we get a palindrome (33563236533).

The spelling of 21330133221 in words is "twenty-one billion, three hundred thirty million, one hundred thirty-three thousand, two hundred twenty-one".