20011110220121 has 2 divisors, whose sum is σ = 20011110220122. Its totient is φ = 20011110220120.

The previous prime is 20011110220103. The next prime is 20011110220159. The reversal of 20011110220121 is 12102201111002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17429046885721 + 2582063334400 = 4174811^2 + 1606880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011110220121 is a prime.

It is a super-2 number, since 2×20011110220121² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20011110220096 and 20011110220105.

It is not a weakly prime, because it can be changed into another prime (20011110220921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005555110060 + 10005555110061.

It is an arithmetic number, because the mean of its divisors is an integer number (10005555110061).

Almost surely, 2^{20011110220121} is an apocalyptic number.

It is an amenable number.

20011110220121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011110220121 is an equidigital number, since it uses as much as digits as its factorization.

20011110220121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20011110220121 its reverse (12102201111002), we get a palindrome (32113311331123).

The spelling of 20011110220121 in words is "twenty trillion, eleven billion, one hundred ten million, two hundred twenty thousand, one hundred twenty-one".