11173385817621 has 6 divisors (see below), whose sum is σ = 16139335069910. Its totient is φ = 7448923878408.

The previous prime is 11173385817547. The next prime is 11173385817631. The reversal of 11173385817621 is 12671858337111.

11173385817621 is a `hidden beast` number, since 1 + 1 + 1 + 7 + 3 + 3 + 8 + 5 + 8 + 1 + 7 + 621 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10789746800625 + 383639016996 = 3284775^2 + 619386^2 .

It is not a de Polignac number, because 11173385817621 - 2⁹ = 11173385817109 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 (11173385817631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 620743656526 + ... + 620743656543.

Almost surely, 2^{11173385817621} is an apocalyptic number.

It is an amenable number.

11173385817621 is a deficient number, since it is larger than the sum of its proper divisors (4965949252289).

11173385817621 is a wasteful number, since it uses less digits than its factorization.

11173385817621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241487313075 (or 1241487313072 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 54.

The spelling of 11173385817621 in words is "eleven trillion, one hundred seventy-three billion, three hundred eighty-five million, eight hundred seventeen thousand, six hundred twenty-one".