210020011222261 has 2 divisors, whose sum is σ = 210020011222262. Its totient is φ = 210020011222260.

The previous prime is 210020011222163. The next prime is 210020011222283. The reversal of 210020011222261 is 162222110020012.

It is an a-pointer prime, because the next prime (210020011222283) can be obtained adding 210020011222261 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112399880738161 + 97620130484100 = 10601881^2 + 9880290^2 .

It is a cyclic number.

It is not a de Polignac number, because 210020011222261 - 2⁹ = 210020011221749 is a prime.

It is a super-2 number, since 2×210020011222261² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210020011222291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010005611130 + 105010005611131.

It is an arithmetic number, because the mean of its divisors is an integer number (105010005611131).

Almost surely, 2^{210020011222261} is an apocalyptic number.

It is an amenable number.

210020011222261 is a deficient number, since it is larger than the sum of its proper divisors (1).

210020011222261 is an equidigital number, since it uses as much as digits as its factorization.

210020011222261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 22.

Adding to 210020011222261 its reverse (162222110020012), we get a palindrome (372242121242273).

The spelling of 210020011222261 in words is "two hundred ten trillion, twenty billion, eleven million, two hundred twenty-two thousand, two hundred sixty-one".