11112641721 has 8 divisors (see below), whose sum is σ = 16463172960. Its totient is φ = 7408427796.

The previous prime is 11112641717. The next prime is 11112641731. The reversal of 11112641721 is 12714621111.

11112641721 is a `hidden beast` number, since 1 + 1 + 1 + 12 + 641 + 7 + 2 + 1 = 666.

It is not a de Polignac number, because 11112641721 - 2² = 11112641717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 411579323 = 11112641721 / (1 + 1 + 1 + 1 + 2 + 6 + 4 + 1 + 7 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (11112641731) 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 7 ways as a sum of consecutive naturals, for example, 205789635 + ... + 205789688.

It is an arithmetic number, because the mean of its divisors is an integer number (2057896620).

Almost surely, 2^11112641721 is an apocalyptic number.

It is an amenable number.

11112641721 is a deficient number, since it is larger than the sum of its proper divisors (5350531239).

11112641721 is an equidigital number, since it uses as much as digits as its factorization.

11112641721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411579332 (or 411579326 counting only the distinct ones).

The product of its digits is 672, while the sum is 27.

The spelling of 11112641721 in words is "eleven billion, one hundred twelve million, six hundred forty-one thousand, seven hundred twenty-one".