21404143323 has 20 divisors (see below), whose sum is σ = 31978485000. Its totient is φ = 14267467872.

The previous prime is 21404143309. The next prime is 21404143349. The reversal of 21404143323 is 32334140412.

21404143323 is a `hidden beast` number, since 214 + 0 + 414 + 3 + 32 + 3 = 666.

It is not a de Polignac number, because 21404143323 - 2⁶ = 21404143259 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (21404143373) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 802303 + ... + 828551.

It is an arithmetic number, because the mean of its divisors is an integer number (1598924250).

Almost surely, 2^21404143323 is an apocalyptic number.

21404143323 is a deficient number, since it is larger than the sum of its proper divisors (10574341677).

21404143323 is a wasteful number, since it uses less digits than its factorization.

21404143323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36328 (or 36319 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21404143323 its reverse (32334140412), we get a palindrome (53738283735).

The spelling of 21404143323 in words is "twenty-one billion, four hundred four million, one hundred forty-three thousand, three hundred twenty-three".