20133221533 has 8 divisors (see below), whose sum is σ = 21332430648. Its totient is φ = 18935668224.

The previous prime is 20133221509. The next prime is 20133221627. The reversal of 20133221533 is 33512233102.

It can be written as a sum of positive squares in 4 ways, for example, as 2490209604 + 17643011929 = 49902^2 + 132827^2 .

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 20133221533 - 2⁵ = 20133221501 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20133221498 and 20133221507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20133221233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388866 + ... + 437587.

It is an arithmetic number, because the mean of its divisors is an integer number (2666553831).

Almost surely, 2^20133221533 is an apocalyptic number.

It is an amenable number.

20133221533 is a deficient number, since it is larger than the sum of its proper divisors (1199209115).

20133221533 is a wasteful number, since it uses less digits than its factorization.

20133221533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827903.

The product of its (nonzero) digits is 3240, while the sum is 25.

Adding to 20133221533 its reverse (33512233102), we get a palindrome (53645454635).

The spelling of 20133221533 in words is "twenty billion, one hundred thirty-three million, two hundred twenty-one thousand, five hundred thirty-three".