121200012121261 has 2 divisors, whose sum is σ = 121200012121262. Its totient is φ = 121200012121260.

The previous prime is 121200012121183. The next prime is 121200012121283. The reversal of 121200012121261 is 162121210002121.

It is an a-pointer prime, because the next prime (121200012121283) can be obtained adding 121200012121261 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., 88287634822500 + 32912377298761 = 9396150^2 + 5736931^2 .

It is a cyclic number.

It is not a de Polignac number, because 121200012121261 - 2⁴⁵ = 86015640032429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121200012121861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600006060630 + 60600006060631.

It is an arithmetic number, because the mean of its divisors is an integer number (60600006060631).

Almost surely, 2^{121200012121261} is an apocalyptic number.

It is an amenable number.

121200012121261 is a deficient number, since it is larger than the sum of its proper divisors (1).

121200012121261 is an equidigital number, since it uses as much as digits as its factorization.

121200012121261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 121200012121261 its reverse (162121210002121), we get a palindrome (283321222123382).

The spelling of 121200012121261 in words is "one hundred twenty-one trillion, two hundred billion, twelve million, one hundred twenty-one thousand, two hundred sixty-one".