21230131344 has 80 divisors (see below), whose sum is σ = 55708571328. Its totient is φ = 6965392896.

The previous prime is 21230131343. The next prime is 21230131361. The reversal of 21230131344 is 44313103212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21230131343) 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, 6034674 + ... + 6038190.

Almost surely, 2^21230131344 is an apocalyptic number.

21230131344 is a gapful number since it is divisible by the number (24) 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 21230131344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27854285664).

21230131344 is an abundant number, since it is smaller than the sum of its proper divisors (34478439984).

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

21230131344 is a wasteful number, since it uses less digits than its factorization.

21230131344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5472 (or 5466 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21230131344 its reverse (44313103212), we get a palindrome (65543234556).

The spelling of 21230131344 in words is "twenty-one billion, two hundred thirty million, one hundred thirty-one thousand, three hundred forty-four".