21144225113 has 8 divisors (see below), whose sum is σ = 23069797920. Its totient is φ = 19219214080.

The previous prime is 21144225103. The next prime is 21144225127. The reversal of 21144225113 is 31152244112.

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 21144225113 - 2¹⁰ = 21144224089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21144225103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59720 + ... + 214137.

It is an arithmetic number, because the mean of its divisors is an integer number (2883724740).

Almost surely, 2^21144225113 is an apocalyptic number.

It is an amenable number.

21144225113 is a deficient number, since it is larger than the sum of its proper divisors (1925572807).

21144225113 is a wasteful number, since it uses less digits than its factorization.

21144225113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280887.

The product of its digits is 1920, while the sum is 26.

Adding to 21144225113 its reverse (31152244112), we get a palindrome (52296469225).

The spelling of 21144225113 in words is "twenty-one billion, one hundred forty-four million, two hundred twenty-five thousand, one hundred thirteen".