220111020121 has 2 divisors, whose sum is σ = 220111020122. Its totient is φ = 220111020120.

The previous prime is 220111020109. The next prime is 220111020137. The reversal of 220111020121 is 121020111022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211290992896 + 8820027225 = 459664^2 + 93915^2 .

It is a cyclic number.

It is not a de Polignac number, because 220111020121 - 2¹³ = 220111011929 is a prime.

It is a super-2 number, since 2×220111020121² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (220111020161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110055510060 + 110055510061.

It is an arithmetic number, because the mean of its divisors is an integer number (110055510061).

Almost surely, 2^220111020121 is an apocalyptic number.

It is an amenable number.

220111020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

220111020121 is an equidigital number, since it uses as much as digits as its factorization.

220111020121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 220111020121 its reverse (121020111022), we get a palindrome (341131131143).

Subtracting from 220111020121 its reverse (121020111022), we obtain a palindrome (99090909099).

The spelling of 220111020121 in words is "two hundred twenty billion, one hundred eleven million, twenty thousand, one hundred twenty-one".