1111206167721 has 12 divisors (see below), whose sum is σ = 1728542927748. Its totient is φ = 683819180064.

The previous prime is 1111206167689. The next prime is 1111206167767. The reversal of 1111206167721 is 1277616021111.

1111206167721 is a `hidden beast` number, since 1 + 1 + 1 + 12 + 0 + 616 + 7 + 7 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 440715410496 + 670490757225 = 663864^2 + 818835^2 .

It is not a de Polignac number, because 1111206167721 - 2⁵ = 1111206167689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1111206167791) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4748744190 + ... + 4748744423.

It is an arithmetic number, because the mean of its divisors is an integer number (144045243979).

Almost surely, 2^{1111206167721} is an apocalyptic number.

It is an amenable number.

1111206167721 is a deficient number, since it is larger than the sum of its proper divisors (617336760027).

1111206167721 is a wasteful number, since it uses less digits than its factorization.

1111206167721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9497488632 (or 9497488629 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 36.

The spelling of 1111206167721 in words is "one trillion, one hundred eleven billion, two hundred six million, one hundred sixty-seven thousand, seven hundred twenty-one".