21118574353 has 4 divisors (see below), whose sum is σ = 21118995568. Its totient is φ = 21118153140.

The previous prime is 21118574297. The next prime is 21118574369. The reversal of 21118574353 is 35347581112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21118574353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21118574383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123351 + ... + 239692.

It is an arithmetic number, because the mean of its divisors is an integer number (5279748892).

Almost surely, 2^21118574353 is an apocalyptic number.

It is an amenable number.

21118574353 is a deficient number, since it is larger than the sum of its proper divisors (421215).

21118574353 is an equidigital number, since it uses as much as digits as its factorization.

21118574353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421214.

The product of its digits is 100800, while the sum is 40.

The spelling of 21118574353 in words is "twenty-one billion, one hundred eighteen million, five hundred seventy-four thousand, three hundred fifty-three".