121201111002001 has 2 divisors, whose sum is σ = 121201111002002. Its totient is φ = 121201111002000.

The previous prime is 121201111001963. The next prime is 121201111002011. The reversal of 121201111002001 is 100200111102121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117308914693776 + 3892196308225 = 10830924^2 + 1972865^2 .

It is a cyclic number.

It is not a de Polignac number, because 121201111002001 - 2¹⁵ = 121201110969233 is a prime.

It is not a weakly prime, because it can be changed into another prime (121201111002011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600555501000 + 60600555501001.

It is an arithmetic number, because the mean of its divisors is an integer number (60600555501001).

Almost surely, 2^{121201111002001} is an apocalyptic number.

It is an amenable number.

121201111002001 is a deficient number, since it is larger than the sum of its proper divisors (1).

121201111002001 is an equidigital number, since it uses as much as digits as its factorization.

121201111002001 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 13.

Adding to 121201111002001 its reverse (100200111102121), we get a palindrome (221401222104122).

The spelling of 121201111002001 in words is "one hundred twenty-one trillion, two hundred one billion, one hundred eleven million, two thousand, one".