21433452231 has 4 divisors (see below), whose sum is σ = 28577936312. Its totient is φ = 14288968152.

The previous prime is 21433452223. The next prime is 21433452247. The reversal of 21433452231 is 13225433412.

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

It is not a de Polignac number, because 21433452231 - 2³ = 21433452223 is a prime.

It is a super-2 number, since 2×21433452231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433452281) 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, 3572242036 + ... + 3572242041.

It is an arithmetic number, because the mean of its divisors is an integer number (7144484078).

Almost surely, 2^21433452231 is an apocalyptic number.

21433452231 is a deficient number, since it is larger than the sum of its proper divisors (7144484081).

21433452231 is an equidigital number, since it uses as much as digits as its factorization.

21433452231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7144484080.

The product of its digits is 17280, while the sum is 30.

Adding to 21433452231 its reverse (13225433412), we get a palindrome (34658885643).

The spelling of 21433452231 in words is "twenty-one billion, four hundred thirty-three million, four hundred fifty-two thousand, two hundred thirty-one".