21344231352 has 64 divisors (see below), whose sum is σ = 55984988160. Its totient is φ = 6772348800.

The previous prime is 21344231351. The next prime is 21344231371. The reversal of 21344231352 is 25313244312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21344231351) 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, 189768 + ... + 280535.

It is an arithmetic number, because the mean of its divisors is an integer number (874765440).

Almost surely, 2^21344231352 is an apocalyptic number.

It is an amenable number.

21344231352 is an abundant number, since it is smaller than the sum of its proper divisors (34640756808).

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

21344231352 is a wasteful number, since it uses less digits than its factorization.

21344231352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470404 (or 470400 counting only the distinct ones).

The product of its digits is 17280, while the sum is 30.

Adding to 21344231352 its reverse (25313244312), we get a palindrome (46657475664).

The spelling of 21344231352 in words is "twenty-one billion, three hundred forty-four million, two hundred thirty-one thousand, three hundred fifty-two".