20121011523 has 16 divisors (see below), whose sum is σ = 29850393600. Its totient is φ = 13395338280.

The previous prime is 20121011503. The next prime is 20121011527. The reversal of 20121011523 is 32511012102.

20121011523 is a `hidden beast` number, since 20 + 121 + 0 + 1 + 1 + 523 = 666.

It is not a de Polignac number, because 20121011523 - 2¹⁰ = 20121010499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121011496 and 20121011505.

It is not an unprimeable number, because it can be changed into a prime (20121011527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 498823 + ... + 537648.

It is an arithmetic number, because the mean of its divisors is an integer number (1865649600).

Almost surely, 2^20121011523 is an apocalyptic number.

20121011523 is a deficient number, since it is larger than the sum of its proper divisors (9729382077).

20121011523 is a wasteful number, since it uses less digits than its factorization.

20121011523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037199 (or 1037193 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 20121011523 its reverse (32511012102), we get a palindrome (52632023625).

The spelling of 20121011523 in words is "twenty billion, one hundred twenty-one million, eleven thousand, five hundred twenty-three".