21145011105 has 8 divisors (see below), whose sum is σ = 33832017792. Its totient is φ = 11277339248.

The previous prime is 21145011073. The next prime is 21145011133. The reversal of 21145011105 is 50111054112.

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

It is a cyclic number.

It is not a de Polignac number, because 21145011105 - 2⁵ = 21145011073 is a prime.

It is a super-2 number, since 2×21145011105² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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, 704833689 + ... + 704833718.

It is an arithmetic number, because the mean of its divisors is an integer number (4229002224).

Almost surely, 2^21145011105 is an apocalyptic number.

It is an amenable number.

21145011105 is a deficient number, since it is larger than the sum of its proper divisors (12687006687).

21145011105 is a wasteful number, since it uses less digits than its factorization.

21145011105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409667415.

The product of its (nonzero) digits is 200, while the sum is 21.

Adding to 21145011105 its reverse (50111054112), we get a palindrome (71256065217).

The spelling of 21145011105 in words is "twenty-one billion, one hundred forty-five million, eleven thousand, one hundred five".