11423143442221 has 64 divisors (see below), whose sum is σ = 13356877086720. Its totient is φ = 9568497600000.

The previous prime is 11423143442209. The next prime is 11423143442231. The reversal of 11423143442221 is 12224434132411.

It is not a de Polignac number, because 11423143442221 - 2²⁹ = 11422606571309 is a prime.

It is a super-2 number, since 2×11423143442221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11423143442201) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18819016900 + ... + 18819017506.

It is an arithmetic number, because the mean of its divisors is an integer number (208701204480).

Almost surely, 2^{11423143442221} is an apocalyptic number.

It is an amenable number.

11423143442221 is a deficient number, since it is larger than the sum of its proper divisors (1933733644499).

11423143442221 is a wasteful number, since it uses less digits than its factorization.

11423143442221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706.

The product of its digits is 36864, while the sum is 34.

Adding to 11423143442221 its reverse (12224434132411), we get a palindrome (23647577574632).

The spelling of 11423143442221 in words is "eleven trillion, four hundred twenty-three billion, one hundred forty-three million, four hundred forty-two thousand, two hundred twenty-one".