121021012212181 has 2 divisors, whose sum is σ = 121021012212182. Its totient is φ = 121021012212180.

The previous prime is 121021012212161. The next prime is 121021012212259. The reversal of 121021012212181 is 181212210120121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85011903636100 + 36009108576081 = 9220190^2 + 6000759^2 .

It is an emirp because it is prime and its reverse (181212210120121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121021012212181 - 2⁹ = 121021012211669 is a prime.

It is a super-2 number, since 2×121021012212181² (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 (121021012212161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510506106090 + 60510506106091.

It is an arithmetic number, because the mean of its divisors is an integer number (60510506106091).

Almost surely, 2^{121021012212181} is an apocalyptic number.

It is an amenable number.

121021012212181 is a deficient number, since it is larger than the sum of its proper divisors (1).

121021012212181 is an equidigital number, since it uses as much as digits as its factorization.

121021012212181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 25.

The spelling of 121021012212181 in words is "one hundred twenty-one trillion, twenty-one billion, twelve million, two hundred twelve thousand, one hundred eighty-one".