21403012133 has 4 divisors (see below), whose sum is σ = 21438625068. Its totient is φ = 21367399200.

The previous prime is 21403012123. The next prime is 21403012151. The reversal of 21403012133 is 33121030412.

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 14143631329 + 7259380804 = 118927^2 + 85202^2 .

It is a cyclic number.

It is not a de Polignac number, because 21403012133 - 2⁴ = 21403012117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21403012123) 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, 17805566 + ... + 17806767.

It is an arithmetic number, because the mean of its divisors is an integer number (5359656267).

Almost surely, 2^21403012133 is an apocalyptic number.

It is an amenable number.

21403012133 is a deficient number, since it is larger than the sum of its proper divisors (35612935).

21403012133 is an equidigital number, since it uses as much as digits as its factorization.

21403012133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35612934.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21403012133 its reverse (33121030412), we get a palindrome (54524042545).

The spelling of 21403012133 in words is "twenty-one billion, four hundred three million, twelve thousand, one hundred thirty-three".