21066333533 has 16 divisors (see below), whose sum is σ = 25010415360. Its totient is φ = 17368310400.

The previous prime is 21066333527. The next prime is 21066333551. The reversal of 21066333533 is 33533366012.

It is not a de Polignac number, because 21066333533 - 2⁴ = 21066333517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21066333493 and 21066333502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21066333583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 496538 + ... + 537291.

It is an arithmetic number, because the mean of its divisors is an integer number (1563150960).

Almost surely, 2^21066333533 is an apocalyptic number.

It is an amenable number.

21066333533 is a deficient number, since it is larger than the sum of its proper divisors (3944081827).

21066333533 is a wasteful number, since it uses less digits than its factorization.

21066333533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033948.

The product of its (nonzero) digits is 87480, while the sum is 35.

Adding to 21066333533 its reverse (33533366012), we get a palindrome (54599699545).

The spelling of 21066333533 in words is "twenty-one billion, sixty-six million, three hundred thirty-three thousand, five hundred thirty-three".