21244142400323 has 4 divisors (see below), whose sum is σ = 21244550045208. Its totient is φ = 21243734755440.

The previous prime is 21244142400317. The next prime is 21244142400329. The reversal of 21244142400323 is 32300424144212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21244142400317) and next prime (21244142400329).

It is a cyclic number.

It is not a de Polignac number, because 21244142400323 - 2¹⁰ = 21244142399299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21244142400323.

It is not an unprimeable number, because it can be changed into a prime (21244142400329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203744261 + ... + 203848502.

It is an arithmetic number, because the mean of its divisors is an integer number (5311137511302).

Almost surely, 2^{21244142400323} is an apocalyptic number.

21244142400323 is a deficient number, since it is larger than the sum of its proper divisors (407644885).

21244142400323 is an equidigital number, since it uses as much as digits as its factorization.

21244142400323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407644884.

The product of its (nonzero) digits is 36864, while the sum is 32.

Adding to 21244142400323 its reverse (32300424144212), we get a palindrome (53544566544535).

The spelling of 21244142400323 in words is "twenty-one trillion, two hundred forty-four billion, one hundred forty-two million, four hundred thousand, three hundred twenty-three".