21234430133 has 12 divisors (see below), whose sum is σ = 24710019840. Its totient is φ = 18194497272.

The previous prime is 21234430123. The next prime is 21234430163. The reversal of 21234430133 is 33103443212.

It is not a de Polignac number, because 21234430133 - 2³⁴ = 4054560949 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 (21234430103) 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 11 ways as a sum of consecutive naturals, for example, 65810 + ... + 216332.

It is an arithmetic number, because the mean of its divisors is an integer number (2059168320).

Almost surely, 2^21234430133 is an apocalyptic number.

It is an amenable number.

21234430133 is a deficient number, since it is larger than the sum of its proper divisors (3475589707).

21234430133 is a wasteful number, since it uses less digits than its factorization.

21234430133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153416 (or 153409 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 21234430133 its reverse (33103443212), we get a palindrome (54337873345).

The spelling of 21234430133 in words is "twenty-one billion, two hundred thirty-four million, four hundred thirty thousand, one hundred thirty-three".