21344311323 has 32 divisors (see below), whose sum is σ = 33008313920. Its totient is φ = 13617953280.

The previous prime is 21344311321. The next prime is 21344311349. The reversal of 21344311323 is 32311344312.

It is a happy number.

21344311323 is a `hidden beast` number, since 2 + 1 + 344 + 311 + 3 + 2 + 3 = 666.

It is not a de Polignac number, because 21344311323 - 2¹ = 21344311321 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21344311321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114190 + ... + 236067.

It is an arithmetic number, because the mean of its divisors is an integer number (1031509810).

Almost surely, 2^21344311323 is an apocalyptic number.

21344311323 is a deficient number, since it is larger than the sum of its proper divisors (11664002597).

21344311323 is a wasteful number, since it uses less digits than its factorization.

21344311323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350364 (or 350358 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

Adding to 21344311323 its reverse (32311344312), we get a palindrome (53655655635).

The spelling of 21344311323 in words is "twenty-one billion, three hundred forty-four million, three hundred eleven thousand, three hundred twenty-three".