21330133533 has 24 divisors (see below), whose sum is σ = 32981488800. Its totient is φ = 13243323744.

The previous prime is 21330133523. The next prime is 21330133543. The reversal of 21330133533 is 33533103312.

21330133533 is a `hidden beast` number, since 2 + 1 + 3 + 301 + 3 + 353 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (21330133523) and next prime (21330133543).

It is not a de Polignac number, because 21330133533 - 2⁹ = 21330133021 is a prime.

It is a super-2 number, since 2×21330133533² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21330133497 and 21330133506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330133523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1047010 + ... + 1067187.

It is an arithmetic number, because the mean of its divisors is an integer number (1374228700).

Almost surely, 2^21330133533 is an apocalyptic number.

It is an amenable number.

21330133533 is a deficient number, since it is larger than the sum of its proper divisors (11651355267).

21330133533 is a wasteful number, since it uses less digits than its factorization.

21330133533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2114281 (or 2114278 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 27.

Adding to 21330133533 its reverse (33533103312), we get a palindrome (54863236845).

The spelling of 21330133533 in words is "twenty-one billion, three hundred thirty million, one hundred thirty-three thousand, five hundred thirty-three".