210122221022261 has 2 divisors, whose sum is σ = 210122221022262. Its totient is φ = 210122221022260.

The previous prime is 210122221022209. The next prime is 210122221022347. The reversal of 210122221022261 is 162220122221012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209143370004100 + 978851018161 = 14461790^2 + 989369^2 .

It is a cyclic number.

It is not a de Polignac number, because 210122221022261 - 2¹⁴ = 210122221005877 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210122221022261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210122221021261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105061110511130 + 105061110511131.

It is an arithmetic number, because the mean of its divisors is an integer number (105061110511131).

Almost surely, 2^{210122221022261} is an apocalyptic number.

It is an amenable number.

210122221022261 is a deficient number, since it is larger than the sum of its proper divisors (1).

210122221022261 is an equidigital number, since it uses as much as digits as its factorization.

210122221022261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 26.

Adding to 210122221022261 its reverse (162220122221012), we get a palindrome (372342343243273).

The spelling of 210122221022261 in words is "two hundred ten trillion, one hundred twenty-two billion, two hundred twenty-one million, twenty-two thousand, two hundred sixty-one".