21431005233 has 8 divisors (see below), whose sum is σ = 31172371296. Its totient is φ = 12988488000.

The previous prime is 21431005231. The next prime is 21431005259. The reversal of 21431005233 is 33250013412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21431005233 - 2¹ = 21431005231 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21431005231) 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 7 ways as a sum of consecutive naturals, for example, 324712168 + ... + 324712233.

It is an arithmetic number, because the mean of its divisors is an integer number (3896546412).

Almost surely, 2^21431005233 is an apocalyptic number.

It is an amenable number.

21431005233 is a deficient number, since it is larger than the sum of its proper divisors (9741366063).

21431005233 is a wasteful number, since it uses less digits than its factorization.

21431005233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649424415.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 21431005233 its reverse (33250013412), we get a palindrome (54681018645).

The spelling of 21431005233 in words is "twenty-one billion, four hundred thirty-one million, five thousand, two hundred thirty-three".