21243231344 has 10 divisors (see below), whose sum is σ = 41158760760. Its totient is φ = 10621615664.

The previous prime is 21243231341. The next prime is 21243231407. The reversal of 21243231344 is 44313234212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243231341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 663850964 + ... + 663850995.

It is an arithmetic number, because the mean of its divisors is an integer number (4115876076).

Almost surely, 2^21243231344 is an apocalyptic number.

It is an amenable number.

21243231344 is a deficient number, since it is larger than the sum of its proper divisors (19915529416).

21243231344 is a wasteful number, since it uses less digits than its factorization.

21243231344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327701967 (or 1327701961 counting only the distinct ones).

The product of its digits is 13824, while the sum is 29.

Adding to 21243231344 its reverse (44313234212), we get a palindrome (65556465556).

The spelling of 21243231344 in words is "twenty-one billion, two hundred forty-three million, two hundred thirty-one thousand, three hundred forty-four".