11538510921 has 12 divisors (see below), whose sum is σ = 19047700672. Its totient is φ = 6593434776.

The previous prime is 11538510911. The next prime is 11538510943. The reversal of 11538510921 is 12901583511.

11538510921 is a `hidden beast` number, since 1 + 1 + 53 + 8 + 510 + 92 + 1 = 666.

It is not a de Polignac number, because 11538510921 - 2¹⁷ = 11538379849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11538510911) 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, 91575421 + ... + 91575546.

Almost surely, 2^11538510921 is an apocalyptic number.

It is an amenable number.

11538510921 is a deficient number, since it is larger than the sum of its proper divisors (7509189751).

11538510921 is a wasteful number, since it uses less digits than its factorization.

11538510921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183150980 (or 183150977 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 36.

The spelling of 11538510921 in words is "eleven billion, five hundred thirty-eight million, five hundred ten thousand, nine hundred twenty-one".