21126404143 has 8 divisors (see below), whose sum is σ = 22762898928. Its totient is φ = 19491536064.

The previous prime is 21126404113. The next prime is 21126404183. The reversal of 21126404143 is 34140462112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21126404143 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 (21126404113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 379630 + ... + 431707.

It is an arithmetic number, because the mean of its divisors is an integer number (2845362366).

Almost surely, 2^21126404143 is an apocalyptic number.

21126404143 is a deficient number, since it is larger than the sum of its proper divisors (1636494785).

21126404143 is a wasteful number, since it uses less digits than its factorization.

21126404143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813353.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21126404143 its reverse (34140462112), we get a palindrome (55266866255).

The spelling of 21126404143 in words is "twenty-one billion, one hundred twenty-six million, four hundred four thousand, one hundred forty-three".