21402044143 has 4 divisors (see below), whose sum is σ = 21407568280. Its totient is φ = 21396520008.

The previous prime is 21402044123. The next prime is 21402044159. The reversal of 21402044143 is 34144020412.

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

It is a cyclic number.

It is not a de Polignac number, because 21402044143 - 2¹³ = 21402035951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21402044113) 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, 2756253 + ... + 2764006.

It is an arithmetic number, because the mean of its divisors is an integer number (5351892070).

Almost surely, 2^21402044143 is an apocalyptic number.

21402044143 is a deficient number, since it is larger than the sum of its proper divisors (5524137).

21402044143 is an equidigital number, since it uses as much as digits as its factorization.

21402044143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5524136.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 21402044143 its reverse (34144020412), we get a palindrome (55546064555).

The spelling of 21402044143 in words is "twenty-one billion, four hundred two million, forty-four thousand, one hundred forty-three".