121210201997 has 2 divisors, whose sum is σ = 121210201998. Its totient is φ = 121210201996.

The previous prime is 121210201993. The next prime is 121210202063. The reversal of 121210201997 is 799102012121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100949811076 + 20260390921 = 317726^2 + 142339^2 .

It is a cyclic number.

It is not a de Polignac number, because 121210201997 - 2² = 121210201993 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121210201993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605100998 + 60605100999.

It is an arithmetic number, because the mean of its divisors is an integer number (60605100999).

Almost surely, 2^121210201997 is an apocalyptic number.

It is an amenable number.

121210201997 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210201997 is an equidigital number, since it uses as much as digits as its factorization.

121210201997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 35.

The spelling of 121210201997 in words is "one hundred twenty-one billion, two hundred ten million, two hundred one thousand, nine hundred ninety-seven".