20112122102021 has 4 divisors (see below), whose sum is σ = 20150725024044. Its totient is φ = 20073519180000.

The previous prime is 20112122102011. The next prime is 20112122102057. The reversal of 20112122102021 is 12020122121102.

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 9864536697796 + 10247585404225 = 3140786^2 + 3201185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20112122102021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112122102011) 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, 19301460230 + ... + 19301461271.

It is an arithmetic number, because the mean of its divisors is an integer number (5037681256011).

Almost surely, 2^{20112122102021} is an apocalyptic number.

It is an amenable number.

20112122102021 is a deficient number, since it is larger than the sum of its proper divisors (38602922023).

20112122102021 is an equidigital number, since it uses as much as digits as its factorization.

20112122102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38602922022.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20112122102021 its reverse (12020122121102), we get a palindrome (32132244223123).

The spelling of 20112122102021 in words is "twenty trillion, one hundred twelve billion, one hundred twenty-two million, one hundred two thousand, twenty-one".