201220999997 has 2 divisors, whose sum is σ = 201220999998. Its totient is φ = 201220999996.

The previous prime is 201220999981. The next prime is 201221000023. The reversal of 201220999997 is 799999022102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152017331236 + 49203668761 = 389894^2 + 221819^2 .

It is a cyclic number.

It is not a de Polignac number, because 201220999997 - 2⁴ = 201220999981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201220999297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610499998 + 100610499999.

It is an arithmetic number, because the mean of its divisors is an integer number (100610499999).

Almost surely, 2^201220999997 is an apocalyptic number.

It is an amenable number.

201220999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

201220999997 is an equidigital number, since it uses as much as digits as its factorization.

201220999997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3306744, while the sum is 59.

The spelling of 201220999997 in words is "two hundred one billion, two hundred twenty million, nine hundred ninety-nine thousand, nine hundred ninety-seven".