21301231344 has 20 divisors (see below), whose sum is σ = 55028181096. Its totient is φ = 7100410432.

The previous prime is 21301231309. The next prime is 21301231361. The reversal of 21301231344 is 44313210312.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221887779 + ... + 221887874.

Almost surely, 2^21301231344 is an apocalyptic number.

21301231344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21301231344 is an abundant number, since it is smaller than the sum of its proper divisors (33726949752).

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

21301231344 is a wasteful number, since it uses less digits than its factorization.

21301231344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443775664 (or 443775658 counting only the distinct ones).

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

Adding to 21301231344 its reverse (44313210312), we get a palindrome (65614441656).

The spelling of 21301231344 in words is "twenty-one billion, three hundred one million, two hundred thirty-one thousand, three hundred forty-four".