20121134493 has 16 divisors (see below), whose sum is σ = 27023023296. Its totient is φ = 13317004800.

The previous prime is 20121134477. The next prime is 20121134503. The reversal of 20121134493 is 39443112102.

It is not a de Polignac number, because 20121134493 - 2⁴ = 20121134477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20121134493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121134393) 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, 198543 + ... + 282243.

It is an arithmetic number, because the mean of its divisors is an integer number (1688938956).

Almost surely, 2^20121134493 is an apocalyptic number.

It is an amenable number.

20121134493 is a deficient number, since it is larger than the sum of its proper divisors (6901888803).

20121134493 is a wasteful number, since it uses less digits than its factorization.

20121134493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84284.

The product of its (nonzero) digits is 5184, while the sum is 30.

Adding to 20121134493 its reverse (39443112102), we get a palindrome (59564246595).

The spelling of 20121134493 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-four thousand, four hundred ninety-three".