11265257221 has 4 divisors (see below), whose sum is σ = 11265523200. Its totient is φ = 11264991244.

The previous prime is 11265257209. The next prime is 11265257233. The reversal of 11265257221 is 12275256211.

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 an interprime number because it is at equal distance from previous prime (11265257209) and next prime (11265257233).

It is a cyclic number.

It is not a de Polignac number, because 11265257221 - 2¹⁷ = 11265126149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11265257291) 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, 53701 + ... + 159418.

It is an arithmetic number, because the mean of its divisors is an integer number (2816380800).

Almost surely, 2^11265257221 is an apocalyptic number.

It is an amenable number.

11265257221 is a deficient number, since it is larger than the sum of its proper divisors (265979).

11265257221 is an equidigital number, since it uses as much as digits as its factorization.

11265257221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265978.

The product of its digits is 16800, while the sum is 34.

The spelling of 11265257221 in words is "eleven billion, two hundred sixty-five million, two hundred fifty-seven thousand, two hundred twenty-one".