1201001221997 has 2 divisors, whose sum is σ = 1201001221998. Its totient is φ = 1201001221996.

The previous prime is 1201001221963. The next prime is 1201001222023. The reversal of 1201001221997 is 7991221001021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 957385928521 + 243615293476 = 978461^2 + 493574^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201001221997 - 2¹⁰ = 1201001220973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201001221297) 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, 600500610998 + 600500610999.

It is an arithmetic number, because the mean of its divisors is an integer number (600500610999).

Almost surely, 2^{1201001221997} is an apocalyptic number.

It is an amenable number.

1201001221997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201001221997 is an equidigital number, since it uses as much as digits as its factorization.

1201001221997 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 1201001221997 in words is "one trillion, two hundred one billion, one million, two hundred twenty-one thousand, nine hundred ninety-seven".