20201332122121 has 4 divisors (see below), whose sum is σ = 20210820772500. Its totient is φ = 20191843471744.

The previous prime is 20201332122119. The next prime is 20201332122157. The reversal of 20201332122121 is 12122123310202.

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 13671032974096 + 6530299148025 = 3697436^2 + 2555445^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201332122121 - 2¹ = 20201332122119 is a prime.

It is a super-3 number, since 3×20201332122121³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20201332122092 and 20201332122101.

It is not an unprimeable number, because it can be changed into a prime (20201332122161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4744321996 + ... + 4744326253.

It is an arithmetic number, because the mean of its divisors is an integer number (5052705193125).

Almost surely, 2^{20201332122121} is an apocalyptic number.

It is an amenable number.

20201332122121 is a deficient number, since it is larger than the sum of its proper divisors (9488650379).

20201332122121 is an equidigital number, since it uses as much as digits as its factorization.

20201332122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9488650378.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 20201332122121 its reverse (12122123310202), we get a palindrome (32323455432323).

The spelling of 20201332122121 in words is "twenty trillion, two hundred one billion, three hundred thirty-two million, one hundred twenty-two thousand, one hundred twenty-one".