21105041353 has 8 divisors (see below), whose sum is σ = 23025068640. Its totient is φ = 19185245280.

The previous prime is 21105041329. The next prime is 21105041371. The reversal of 21105041353 is 35314050112.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21105041353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21105041383) 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, 173226 + ... + 268732.

It is an arithmetic number, because the mean of its divisors is an integer number (2878133580).

Almost surely, 2^21105041353 is an apocalyptic number.

It is an amenable number.

21105041353 is a deficient number, since it is larger than the sum of its proper divisors (1920027287).

21105041353 is a wasteful number, since it uses less digits than its factorization.

21105041353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115607.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 21105041353 its reverse (35314050112), we get a palindrome (56419091465).

The spelling of 21105041353 in words is "twenty-one billion, one hundred five million, forty-one thousand, three hundred fifty-three".