20121010221121 has 4 divisors (see below), whose sum is σ = 20138491551744. Its totient is φ = 20103528890500.

The previous prime is 20121010221077. The next prime is 20121010221149. The reversal of 20121010221121 is 12112201012102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20121010221121 - 2²¹ = 20121008123969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20121010221095 and 20121010221104.

It is not an unprimeable number, because it can be changed into a prime (20121010221161) 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, 8740663585 + ... + 8740665886.

It is an arithmetic number, because the mean of its divisors is an integer number (5034622887936).

Almost surely, 2^{20121010221121} is an apocalyptic number.

It is an amenable number.

20121010221121 is a deficient number, since it is larger than the sum of its proper divisors (17481330623).

20121010221121 is a wasteful number, since it uses less digits than its factorization.

20121010221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17481330622.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20121010221121 its reverse (12112201012102), we get a palindrome (32233211233223).

The spelling of 20121010221121 in words is "twenty trillion, one hundred twenty-one billion, ten million, two hundred twenty-one thousand, one hundred twenty-one".