121000200012721 has 2 divisors, whose sum is σ = 121000200012722. Its totient is φ = 121000200012720.

The previous prime is 121000200012677. The next prime is 121000200012823. The reversal of 121000200012721 is 127210002000121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101463092806321 + 19537107206400 = 10072889^2 + 4420080^2 .

It is a cyclic number.

It is not a de Polignac number, because 121000200012721 - 2²⁹ = 120999663141809 is a prime.

It is not a weakly prime, because it can be changed into another prime (121000200022721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60500100006360 + 60500100006361.

It is an arithmetic number, because the mean of its divisors is an integer number (60500100006361).

Almost surely, 2^{121000200012721} is an apocalyptic number.

It is an amenable number.

121000200012721 is a deficient number, since it is larger than the sum of its proper divisors (1).

121000200012721 is an equidigital number, since it uses as much as digits as its factorization.

121000200012721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 121000200012721 its reverse (127210002000121), we get a palindrome (248210202012842).

The spelling of 121000200012721 in words is "one hundred twenty-one trillion, two hundred million, twelve thousand, seven hundred twenty-one".