121211122022261 has 2 divisors, whose sum is σ = 121211122022262. Its totient is φ = 121211122022260.

The previous prime is 121211122022201. The next prime is 121211122022297. The reversal of 121211122022261 is 162220221112121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119721455392900 + 1489666629361 = 10941730^2 + 1220519^2 .

It is a cyclic number.

It is not a de Polignac number, because 121211122022261 - 2¹⁰ = 121211122021237 is a prime.

It is a super-2 number, since 2×121211122022261² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121211122022261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121211122022201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605561011130 + 60605561011131.

It is an arithmetic number, because the mean of its divisors is an integer number (60605561011131).

Almost surely, 2^{121211122022261} is an apocalyptic number.

It is an amenable number.

121211122022261 is a deficient number, since it is larger than the sum of its proper divisors (1).

121211122022261 is an equidigital number, since it uses as much as digits as its factorization.

121211122022261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 26.

Adding to 121211122022261 its reverse (162220221112121), we get a palindrome (283431343134382).

The spelling of 121211122022261 in words is "one hundred twenty-one trillion, two hundred eleven billion, one hundred twenty-two million, twenty-two thousand, two hundred sixty-one".