11385988221897 has 24 divisors (see below), whose sum is σ = 16896928478976. Its totient is φ = 7384669429056.

The previous prime is 11385988221889. The next prime is 11385988221917. The reversal of 11385988221897 is 79812288958311.

11385988221897 is a `hidden beast` number, since 1 + 1 + 3 + 8 + 598 + 8 + 2 + 21 + 8 + 9 + 7 = 666.

It is not a de Polignac number, because 11385988221897 - 2³ = 11385988221889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11385988221997) 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 23 ways as a sum of consecutive naturals, for example, 80519868 + ... + 80661149.

It is an arithmetic number, because the mean of its divisors is an integer number (704038686624).

Almost surely, 2^{11385988221897} is an apocalyptic number.

It is an amenable number.

11385988221897 is a deficient number, since it is larger than the sum of its proper divisors (5510940257079).

11385988221897 is a wasteful number, since it uses less digits than its factorization.

11385988221897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161181237 (or 161181234 counting only the distinct ones).

The product of its digits is 139345920, while the sum is 72.

Adding to 11385988221897 its sum of digits (72), we get a square (11385988221969 = 3374313²).

The spelling of 11385988221897 in words is "eleven trillion, three hundred eighty-five billion, nine hundred eighty-eight million, two hundred twenty-one thousand, eight hundred ninety-seven".