21433200431 has 4 divisors (see below), whose sum is σ = 21446489832. Its totient is φ = 21419911032.

The previous prime is 21433200379. The next prime is 21433200511. The reversal of 21433200431 is 13400233412.

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

It is a cyclic number.

It is not a de Polignac number, because 21433200431 - 2⁶ = 21433200367 is a prime.

It is a super-2 number, since 2×21433200431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21433200397 and 21433200406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433208431) 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, 6642281 + ... + 6645506.

It is an arithmetic number, because the mean of its divisors is an integer number (5361622458).

Almost surely, 2^21433200431 is an apocalyptic number.

21433200431 is a deficient number, since it is larger than the sum of its proper divisors (13289401).

21433200431 is a wasteful number, since it uses less digits than its factorization.

21433200431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13289400.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21433200431 its reverse (13400233412), we get a palindrome (34833433843).

The spelling of 21433200431 in words is "twenty-one billion, four hundred thirty-three million, two hundred thousand, four hundred thirty-one".