1211201019997 has 2 divisors, whose sum is σ = 1211201019998. Its totient is φ = 1211201019996.

The previous prime is 1211201019877. The next prime is 1211201020021. The reversal of 1211201019997 is 7999101021121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1185951492196 + 25249527801 = 1089014^2 + 158901^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211201019997 - 2²⁷ = 1211066802269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211201019697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605600509998 + 605600509999.

It is an arithmetic number, because the mean of its divisors is an integer number (605600509999).

Almost surely, 2^{1211201019997} is an apocalyptic number.

It is an amenable number.

1211201019997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211201019997 is an equidigital number, since it uses as much as digits as its factorization.

1211201019997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 43.

The spelling of 1211201019997 in words is "one trillion, two hundred eleven billion, two hundred one million, nineteen thousand, nine hundred ninety-seven".