20121134345 has 16 divisors (see below), whose sum is σ = 26005734720. Its totient is φ = 14856947904.

The previous prime is 20121134339. The next prime is 20121134347. The reversal of 20121134345 is 54343112102.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20121134345 - 2¹⁰ = 20121133321 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20121134347) 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, 892826 + ... + 915084.

It is an arithmetic number, because the mean of its divisors is an integer number (1625358420).

Almost surely, 2^20121134345 is an apocalyptic number.

It is an amenable number.

20121134345 is a deficient number, since it is larger than the sum of its proper divisors (5884600375).

20121134345 is a wasteful number, since it uses less digits than its factorization.

20121134345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36184.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 20121134345 its reverse (54343112102), we get a palindrome (74464246447).

The spelling of 20121134345 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-four thousand, three hundred forty-five".