20122100122121 has 4 divisors (see below), whose sum is σ = 20122283045700. Its totient is φ = 20121917198544.

The previous prime is 20122100122067. The next prime is 20122100122153. The reversal of 20122100122121 is 12122100122102.

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 5065488440896 + 15056611681225 = 2250664^2 + 3880285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20122100122121 is a prime.

It is a super-2 number, since 2×20122100122121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20122100122121.

It is not an unprimeable number, because it can be changed into a prime (20122100124121) 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, 91296686 + ... + 91516823.

It is an arithmetic number, because the mean of its divisors is an integer number (5030570761425).

Almost surely, 2^{20122100122121} is an apocalyptic number.

It is an amenable number.

20122100122121 is a deficient number, since it is larger than the sum of its proper divisors (182923579).

20122100122121 is a wasteful number, since it uses less digits than its factorization.

20122100122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182923578.

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

Adding to 20122100122121 its reverse (12122100122102), we get a palindrome (32244200244223).

The spelling of 20122100122121 in words is "twenty trillion, one hundred twenty-two billion, one hundred million, one hundred twenty-two thousand, one hundred twenty-one".