121000212011221 has 2 divisors, whose sum is σ = 121000212011222. Its totient is φ = 121000212011220.

The previous prime is 121000212011197. The next prime is 121000212011249. The reversal of 121000212011221 is 122110212000121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64861906508721 + 56138305502500 = 8053689^2 + 7492550^2 .

It is a cyclic number.

It is not a de Polignac number, because 121000212011221 - 2²¹ = 121000209914069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121000212011195 and 121000212011204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121000212011251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60500106005610 + 60500106005611.

It is an arithmetic number, because the mean of its divisors is an integer number (60500106005611).

Almost surely, 2^{121000212011221} is an apocalyptic number.

It is an amenable number.

121000212011221 is a deficient number, since it is larger than the sum of its proper divisors (1).

121000212011221 is an equidigital number, since it uses as much as digits as its factorization.

121000212011221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121000212011221 its reverse (122110212000121), we get a palindrome (243110424011342).

The spelling of 121000212011221 in words is "one hundred twenty-one trillion, two hundred twelve million, eleven thousand, two hundred twenty-one".