23421431551 has 16 divisors (see below), whose sum is σ = 27326376000. Its totient is φ = 20066139744.

The previous prime is 23421431503. The next prime is 23421431569. The reversal of 23421431551 is 15513412432.

It is not a de Polignac number, because 23421431551 - 2¹³ = 23421423359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23421431591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 777201 + ... + 806773.

It is an arithmetic number, because the mean of its divisors is an integer number (1707898500).

Almost surely, 2^23421431551 is an apocalyptic number.

23421431551 is a deficient number, since it is larger than the sum of its proper divisors (3904944449).

23421431551 is an equidigital number, since it uses as much as digits as its factorization.

23421431551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31903 (or 31889 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

Adding to 23421431551 its reverse (15513412432), we get a palindrome (38934843983).

The spelling of 23421431551 in words is "twenty-three billion, four hundred twenty-one million, four hundred thirty-one thousand, five hundred fifty-one".