21220330133 has 8 divisors (see below), whose sum is σ = 21352170840. Its totient is φ = 21088650240.

The previous prime is 21220330123. The next prime is 21220330147. The reversal of 21220330133 is 33103302212.

It can be written as a sum of positive squares in 4 ways, for example, as 2539454449 + 18680875684 = 50393^2 + 136678^2 .

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 21220330133 - 2³² = 16925362837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220330123) 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, 230141 + ... + 308877.

It is an arithmetic number, because the mean of its divisors is an integer number (2669021355).

Almost surely, 2^21220330133 is an apocalyptic number.

It is an amenable number.

21220330133 is a deficient number, since it is larger than the sum of its proper divisors (131840707).

21220330133 is a wasteful number, since it uses less digits than its factorization.

21220330133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80407.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21220330133 its reverse (33103302212), we get a palindrome (54323632345).

The spelling of 21220330133 in words is "twenty-one billion, two hundred twenty million, three hundred thirty thousand, one hundred thirty-three".