11404543042521 has 12 divisors (see below), whose sum is σ = 16474183645972. Its totient is φ = 7602588014976.

The previous prime is 11404543042499. The next prime is 11404543042531. The reversal of 11404543042521 is 12524034540411.

11404543042521 is a `hidden beast` number, since 1 + 1 + 40 + 4 + 54 + 3 + 0 + 42 + 521 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3434113034496 + 7970430008025 = 1853136^2 + 2823195^2 .

It is not a de Polignac number, because 11404543042521 - 2⁶ = 11404543042457 is a prime.

It is a super-2 number, since 2×11404543042521² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11404543042531) 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, 36559396 + ... + 36870021.

Almost surely, 2^{11404543042521} is an apocalyptic number.

It is an amenable number.

11404543042521 is a deficient number, since it is larger than the sum of its proper divisors (5069640603451).

11404543042521 is a wasteful number, since it uses less digits than its factorization.

11404543042521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73446680 (or 73446677 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

Adding to 11404543042521 its reverse (12524034540411), we get a palindrome (23928577582932).

The spelling of 11404543042521 in words is "eleven trillion, four hundred four billion, five hundred forty-three million, forty-two thousand, five hundred twenty-one".