21232342453 has 4 divisors (see below), whose sum is σ = 24265534240. Its totient is φ = 18199150668.

The previous prime is 21232342409. The next prime is 21232342493. The reversal of 21232342453 is 35424323212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21232342453 - 2⁹ = 21232341941 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 (21232342403) 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, 1516595883 + ... + 1516595896.

It is an arithmetic number, because the mean of its divisors is an integer number (6066383560).

Almost surely, 2^21232342453 is an apocalyptic number.

It is an amenable number.

21232342453 is a deficient number, since it is larger than the sum of its proper divisors (3033191787).

21232342453 is an equidigital number, since it uses as much as digits as its factorization.

21232342453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3033191786.

The product of its digits is 34560, while the sum is 31.

Adding to 21232342453 its reverse (35424323212), we get a palindrome (56656665665).

The spelling of 21232342453 in words is "twenty-one billion, two hundred thirty-two million, three hundred forty-two thousand, four hundred fifty-three".