11572121071 has 16 divisors (see below), whose sum is σ = 13496113728. Its totient is φ = 9716428800.

The previous prime is 11572121039. The next prime is 11572121087. The reversal of 11572121071 is 17012127511.

It is a cyclic number.

It is not a de Polignac number, because 11572121071 - 2⁵ = 11572121039 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 (11572127071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213481 + ... + 262141.

It is an arithmetic number, because the mean of its divisors is an integer number (843507108).

Almost surely, 2^11572121071 is an apocalyptic number.

11572121071 is a deficient number, since it is larger than the sum of its proper divisors (1923992657).

11572121071 is an equidigital number, since it uses as much as digits as its factorization.

11572121071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49362.

The product of its (nonzero) digits is 980, while the sum is 28.

Adding to 11572121071 its reverse (17012127511), we get a palindrome (28584248582).

The spelling of 11572121071 in words is "eleven billion, five hundred seventy-two million, one hundred twenty-one thousand, seventy-one".