20121134511 has 4 divisors (see below), whose sum is σ = 26828179352. Its totient is φ = 13414089672.

The previous prime is 20121134503. The next prime is 20121134521. The reversal of 20121134511 is 11543112102.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20121134511 - 2³ = 20121134503 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 (20121134521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3353522416 + ... + 3353522421.

It is an arithmetic number, because the mean of its divisors is an integer number (6707044838).

Almost surely, 2^20121134511 is an apocalyptic number.

20121134511 is a deficient number, since it is larger than the sum of its proper divisors (6707044841).

20121134511 is an equidigital number, since it uses as much as digits as its factorization.

20121134511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6707044840.

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 20121134511 its reverse (11543112102), we get a palindrome (31664246613).

The spelling of 20121134511 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-four thousand, five hundred eleven".