21335748897 has 4 divisors (see below), whose sum is σ = 28447665200. Its totient is φ = 14223832596.

The previous prime is 21335748883. The next prime is 21335748923. The reversal of 21335748897 is 79884753312.

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 not a de Polignac number, because 21335748897 - 2¹¹ = 21335746849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21335748817) 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, 3555958147 + ... + 3555958152.

It is an arithmetic number, because the mean of its divisors is an integer number (7111916300).

Almost surely, 2^21335748897 is an apocalyptic number.

It is an amenable number.

21335748897 is a deficient number, since it is larger than the sum of its proper divisors (7111916303).

21335748897 is an equidigital number, since it uses as much as digits as its factorization.

21335748897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7111916302.

The product of its digits is 10160640, while the sum is 57.

The spelling of 21335748897 in words is "twenty-one billion, three hundred thirty-five million, seven hundred forty-eight thousand, eight hundred ninety-seven".