1200211199981 has 2 divisors, whose sum is σ = 1200211199982. Its totient is φ = 1200211199980.

The previous prime is 1200211199921. The next prime is 1200211200113. The reversal of 1200211199981 is 1899911120021.

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., 986166177481 + 214045022500 = 993059^2 + 462650^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200211199981 - 2¹⁸ = 1200210937837 is a prime.

It is a super-2 number, since 2×1200211199981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200211199921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600105599990 + 600105599991.

It is an arithmetic number, because the mean of its divisors is an integer number (600105599991).

Almost surely, 2^{1200211199981} is an apocalyptic number.

It is an amenable number.

1200211199981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200211199981 is an equidigital number, since it uses as much as digits as its factorization.

1200211199981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 44.

The spelling of 1200211199981 in words is "one trillion, two hundred billion, two hundred eleven million, one hundred ninety-nine thousand, nine hundred eighty-one".