21848268257 has 4 divisors (see below), whose sum is σ = 22553051136. Its totient is φ = 21143485380.

The previous prime is 21848268241. The next prime is 21848268371. The reversal of 21848268257 is 75286284812.

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 a cyclic number.

It is not a de Polignac number, because 21848268257 - 2⁴ = 21848268241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21848268199 and 21848268208.

It is not an unprimeable number, because it can be changed into a prime (21848268217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352391393 + ... + 352391454.

It is an arithmetic number, because the mean of its divisors is an integer number (5638262784).

Almost surely, 2^21848268257 is an apocalyptic number.

It is an amenable number.

21848268257 is a deficient number, since it is larger than the sum of its proper divisors (704782879).

21848268257 is an equidigital number, since it uses as much as digits as its factorization.

21848268257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704782878.

The product of its digits is 3440640, while the sum is 53.

The spelling of 21848268257 in words is "twenty-one billion, eight hundred forty-eight million, two hundred sixty-eight thousand, two hundred fifty-seven".