20121134492 has 12 divisors (see below), whose sum is σ = 35213010000. Its totient is φ = 10060274496.

The previous prime is 20121134477. The next prime is 20121134503. The reversal of 20121134492 is 29443112102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174884 + ... + 266132.

It is an arithmetic number, because the mean of its divisors is an integer number (2934417500).

Almost surely, 2^20121134492 is an apocalyptic number.

It is an amenable number.

20121134492 is a deficient number, since it is larger than the sum of its proper divisors (15091875508).

20121134492 is a wasteful number, since it uses less digits than its factorization.

20121134492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146380 (or 146378 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

Adding to 20121134492 its reverse (29443112102), we get a palindrome (49564246594).

The spelling of 20121134492 in words is "twenty billion, one hundred twenty-one million, one hundred thirty-four thousand, four hundred ninety-two".