121000200721 has 2 divisors, whose sum is σ = 121000200722. Its totient is φ = 121000200720.

The previous prime is 121000200707. The next prime is 121000200791. The reversal of 121000200721 is 127002000121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89844067600 + 31156133121 = 299740^2 + 176511^2 .

It is an emirp because it is prime and its reverse (127002000121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121000200721 - 2¹³ = 121000192529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121000200695 and 121000200704.

It is not a weakly prime, because it can be changed into another prime (121000200791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60500100360 + 60500100361.

It is an arithmetic number, because the mean of its divisors is an integer number (60500100361).

Almost surely, 2^121000200721 is an apocalyptic number.

It is an amenable number.

121000200721 is a deficient number, since it is larger than the sum of its proper divisors (1).

121000200721 is an equidigital number, since it uses as much as digits as its factorization.

121000200721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 16.

Adding to 121000200721 its reverse (127002000121), we get a palindrome (248002200842).

The spelling of 121000200721 in words is "one hundred twenty-one billion, two hundred thousand, seven hundred twenty-one".