20121134523 has 16 divisors (see below), whose sum is σ = 31373819136. Its totient is φ = 11230400160.

The previous prime is 20121134521. The next prime is 20121134549. The reversal of 20121134523 is 32543112102.

It is not a de Polignac number, because 20121134523 - 2¹ = 20121134521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20121134493 and 20121134502.

It is not an unprimeable number, because it can be changed into a prime (20121134521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11140368 + ... + 11142173.

It is an arithmetic number, because the mean of its divisors is an integer number (1960863696).

Almost surely, 2^20121134523 is an apocalyptic number.

20121134523 is a deficient number, since it is larger than the sum of its proper divisors (11252684613).

20121134523 is a wasteful number, since it uses less digits than its factorization.

20121134523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22282594.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 20121134523 its reverse (32543112102), we get a palindrome (52664246625).

The spelling of 20121134523 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-four thousand, five hundred twenty-three".