1200010221997 has 2 divisors, whose sum is σ = 1200010221998. Its totient is φ = 1200010221996.

The previous prime is 1200010221967. The next prime is 1200010222051. The reversal of 1200010221997 is 7991220100021.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1163494451716 + 36515770281 = 1078654^2 + 191091^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200010221997 - 2⁷ = 1200010221869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200010221967) 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, 600005110998 + 600005110999.

It is an arithmetic number, because the mean of its divisors is an integer number (600005110999).

Almost surely, 2^{1200010221997} is an apocalyptic number.

It is an amenable number.

1200010221997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200010221997 is an equidigital number, since it uses as much as digits as its factorization.

1200010221997 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 34.

The spelling of 1200010221997 in words is "one trillion, two hundred billion, ten million, two hundred twenty-one thousand, nine hundred ninety-seven".