21044123135 has 8 divisors (see below), whose sum is σ = 28860511776. Its totient is φ = 14430255840.

The previous prime is 21044123123. The next prime is 21044123137. The reversal of 21044123135 is 53132144012.

It is a happy number.

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

It is not a de Polignac number, because 21044123135 - 2⁴ = 21044123119 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 (21044123137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300630296 + ... + 300630365.

It is an arithmetic number, because the mean of its divisors is an integer number (3607563972).

Almost surely, 2^21044123135 is an apocalyptic number.

21044123135 is a deficient number, since it is larger than the sum of its proper divisors (7816388641).

21044123135 is an equidigital number, since it uses as much as digits as its factorization.

21044123135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601260673.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 21044123135 its reverse (53132144012), we get a palindrome (74176267147).

The spelling of 21044123135 in words is "twenty-one billion, forty-four million, one hundred twenty-three thousand, one hundred thirty-five".