20011112202121 has 4 divisors (see below), whose sum is σ = 20388680356932. Its totient is φ = 19633544047312.

The previous prime is 20011112202097. The next prime is 20011112202187. The reversal of 20011112202121 is 12120221111002.

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 12572619632521 + 7438492569600 = 3545789^2 + 2727360^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011112202121 - 2⁵ = 20011112202089 is a prime.

It is a super-2 number, since 2×20011112202121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011112202095 and 20011112202104.

It is not an unprimeable number, because it can be changed into a prime (20011112202721) 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, 188784077326 + ... + 188784077431.

It is an arithmetic number, because the mean of its divisors is an integer number (5097170089233).

Almost surely, 2^{20011112202121} is an apocalyptic number.

It is an amenable number.

20011112202121 is a deficient number, since it is larger than the sum of its proper divisors (377568154811).

20011112202121 is an equidigital number, since it uses as much as digits as its factorization.

20011112202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377568154810.

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

Adding to 20011112202121 its reverse (12120221111002), we get a palindrome (32131333313123).

The spelling of 20011112202121 in words is "twenty trillion, eleven billion, one hundred twelve million, two hundred two thousand, one hundred twenty-one".