210111112321261 has 2 divisors, whose sum is σ = 210111112321262. Its totient is φ = 210111112321260.

The previous prime is 210111112321217. The next prime is 210111112321303. The reversal of 210111112321261 is 162123211111012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136643825775625 + 73467286545636 = 11689475^2 + 8571306^2 .

It is a cyclic number.

It is not a de Polignac number, because 210111112321261 - 2⁷ = 210111112321133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210111112321961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105055556160630 + 105055556160631.

It is an arithmetic number, because the mean of its divisors is an integer number (105055556160631).

Almost surely, 2^{210111112321261} is an apocalyptic number.

It is an amenable number.

210111112321261 is a deficient number, since it is larger than the sum of its proper divisors (1).

210111112321261 is an equidigital number, since it uses as much as digits as its factorization.

210111112321261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 25.

Adding to 210111112321261 its reverse (162123211111012), we get a palindrome (372234323432273).

The spelling of 210111112321261 in words is "two hundred ten trillion, one hundred eleven billion, one hundred twelve million, three hundred twenty-one thousand, two hundred sixty-one".