20132131121 has 4 divisors (see below), whose sum is σ = 20146924644. Its totient is φ = 20117337600.

The previous prime is 20132131069. The next prime is 20132131133. The reversal of 20132131121 is 12113123102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12535265521 + 7596865600 = 111961^2 + 87160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20132131121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20132131121.

It is not an unprimeable number, because it can be changed into a prime (20132131421) 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, 7394720 + ... + 7397441.

It is an arithmetic number, because the mean of its divisors is an integer number (5036731161).

Almost surely, 2^20132131121 is an apocalyptic number.

It is an amenable number.

20132131121 is a deficient number, since it is larger than the sum of its proper divisors (14793523).

20132131121 is a wasteful number, since it uses less digits than its factorization.

20132131121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14793522.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20132131121 its reverse (12113123102), we get a palindrome (32245254223).

The spelling of 20132131121 in words is "twenty billion, one hundred thirty-two million, one hundred thirty-one thousand, one hundred twenty-one".