220211122121021 has 2 divisors, whose sum is σ = 220211122121022. Its totient is φ = 220211122121020.

The previous prime is 220211122121017. The next prime is 220211122121117. The reversal of 220211122121021 is 120121221112022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209731625908996 + 10479496212025 = 14482114^2 + 3237205^2 .

It is a cyclic number.

It is not a de Polignac number, because 220211122121021 - 2² = 220211122121017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220211122120984 and 220211122121002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220211122121321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110105561060510 + 110105561060511.

It is an arithmetic number, because the mean of its divisors is an integer number (110105561060511).

Almost surely, 2^{220211122121021} is an apocalyptic number.

It is an amenable number.

220211122121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

220211122121021 is an equidigital number, since it uses as much as digits as its factorization.

220211122121021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 220211122121021 its reverse (120121221112022), we get a palindrome (340332343233043).

The spelling of 220211122121021 in words is "two hundred twenty trillion, two hundred eleven billion, one hundred twenty-two million, one hundred twenty-one thousand, twenty-one".