21449825193 has 4 divisors (see below), whose sum is σ = 28599766928. Its totient is φ = 14299883460.

The previous prime is 21449825141. The next prime is 21449825197. The reversal of 21449825193 is 39152894412.

It is a happy number.

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 21449825193 - 2⁸ = 21449824937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21449825197) 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, 3574970863 + ... + 3574970868.

It is an arithmetic number, because the mean of its divisors is an integer number (7149941732).

Almost surely, 2^21449825193 is an apocalyptic number.

It is an amenable number.

21449825193 is a deficient number, since it is larger than the sum of its proper divisors (7149941735).

21449825193 is an equidigital number, since it uses as much as digits as its factorization.

21449825193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7149941734.

The product of its digits is 622080, while the sum is 48.

The spelling of 21449825193 in words is "twenty-one billion, four hundred forty-nine million, eight hundred twenty-five thousand, one hundred ninety-three".