21234000133 has 4 divisors (see below), whose sum is σ = 21234543628. Its totient is φ = 21233456640.

The previous prime is 21234000097. The next prime is 21234000167. The reversal of 21234000133 is 33100043212.

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 11253390724 + 9980609409 = 106082^2 + 99903^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21234000133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21234000133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234000173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208188 + ... + 292933.

It is an arithmetic number, because the mean of its divisors is an integer number (5308635907).

Almost surely, 2^21234000133 is an apocalyptic number.

It is an amenable number.

21234000133 is a deficient number, since it is larger than the sum of its proper divisors (543495).

21234000133 is an equidigital number, since it uses as much as digits as its factorization.

21234000133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543494.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21234000133 its reverse (33100043212), we get a palindrome (54334043345).

The spelling of 21234000133 in words is "twenty-one billion, two hundred thirty-four million, one hundred thirty-three", and thus it is an aban number.