21534050233 has 4 divisors (see below), whose sum is σ = 21537755428. Its totient is φ = 21530345040.

The previous prime is 21534050231. The next prime is 21534050243. The reversal of 21534050233 is 33205043512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20647678249 + 886371984 = 143693^2 + 29772^2 .

It is a cyclic number.

It is not a de Polignac number, because 21534050233 - 2¹ = 21534050231 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21534050231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1843866 + ... + 1855507.

It is an arithmetic number, because the mean of its divisors is an integer number (5384438857).

Almost surely, 2^21534050233 is an apocalyptic number.

It is an amenable number.

21534050233 is a deficient number, since it is larger than the sum of its proper divisors (3705195).

21534050233 is an equidigital number, since it uses as much as digits as its factorization.

21534050233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3705194.

The product of its (nonzero) digits is 10800, while the sum is 28.

Adding to 21534050233 its reverse (33205043512), we get a palindrome (54739093745).

The spelling of 21534050233 in words is "twenty-one billion, five hundred thirty-four million, fifty thousand, two hundred thirty-three".