1200210100121 has 2 divisors, whose sum is σ = 1200210100122. Its totient is φ = 1200210100120.

The previous prime is 1200210100073. The next prime is 1200210100153. The reversal of 1200210100121 is 1210010120021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1200034802521 + 175297600 = 1095461^2 + 13240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200210100121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1200210120121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600105050060 + 600105050061.

It is an arithmetic number, because the mean of its divisors is an integer number (600105050061).

Almost surely, 2^{1200210100121} is an apocalyptic number.

It is an amenable number.

1200210100121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200210100121 is an equidigital number, since it uses as much as digits as its factorization.

1200210100121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1200210100121 its reverse (1210010120021), we get a palindrome (2410220220142).

The spelling of 1200210100121 in words is "one trillion, two hundred billion, two hundred ten million, one hundred thousand, one hundred twenty-one".