21232342452 has 96 divisors (see below), whose sum is σ = 54471352320. Its totient is φ = 6407026560.

The previous prime is 21232342409. The next prime is 21232342493. The reversal of 21232342452 is 25424323212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9558702 + ... + 9560922.

It is an arithmetic number, because the mean of its divisors is an integer number (567409920).

Almost surely, 2^21232342452 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21232342452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27235676160).

21232342452 is an abundant number, since it is smaller than the sum of its proper divisors (33239009868).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21232342452 is a wasteful number, since it uses less digits than its factorization.

21232342452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4093 (or 4091 counting only the distinct ones).

The product of its digits is 23040, while the sum is 30.

Adding to 21232342452 its reverse (25424323212), we get a palindrome (46656665664).

The spelling of 21232342452 in words is "twenty-one billion, two hundred thirty-two million, three hundred forty-two thousand, four hundred fifty-two".