21230020533 has 8 divisors (see below), whose sum is σ = 29537419968. Its totient is φ = 13537984064.

The previous prime is 21230020531. The next prime is 21230020541. The reversal of 21230020533 is 33502003212.

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 21230020533 - 2¹ = 21230020531 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230020531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153840660 + ... + 153840797.

It is an arithmetic number, because the mean of its divisors is an integer number (3692177496).

Almost surely, 2^21230020533 is an apocalyptic number.

21230020533 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21230020533 is a deficient number, since it is larger than the sum of its proper divisors (8307399435).

21230020533 is a wasteful number, since it uses less digits than its factorization.

21230020533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307681483.

The product of its (nonzero) digits is 1080, while the sum is 21.

Adding to 21230020533 its reverse (33502003212), we get a palindrome (54732023745).

The spelling of 21230020533 in words is "twenty-one billion, two hundred thirty million, twenty thousand, five hundred thirty-three".