21232342400 has 96 divisors (see below), whose sum is σ = 52533784200. Its totient is φ = 8479457280.

The previous prime is 21232342381. The next prime is 21232342403. The reversal of 21232342400 is 424323212.

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 11 ways as a sum of consecutive naturals, for example, 2148671 + ... + 2158529.

Almost surely, 2^21232342400 is an apocalyptic number.

21232342400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21232342400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26266892100).

21232342400 is an abundant number, since it is smaller than the sum of its proper divisors (31301441800).

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

21232342400 is an equidigital number, since it uses as much as digits as its factorization.

21232342400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10556 (or 10539 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21232342400 its reverse (424323212), we get a palindrome (21656665612).

The spelling of 21232342400 in words is "twenty-one billion, two hundred thirty-two million, three hundred forty-two thousand, four hundred".