1211100131999 has 2 divisors, whose sum is σ = 1211100132000. Its totient is φ = 1211100131998.

The previous prime is 1211100131981. The next prime is 1211100132041. The reversal of 1211100131999 is 9991310011121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (9991310011121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1211100131999 - 2³² = 1206805164703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211100131959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605550065999 + 605550066000.

It is an arithmetic number, because the mean of its divisors is an integer number (605550066000).

Almost surely, 2^{1211100131999} is an apocalyptic number.

1211100131999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211100131999 is an equidigital number, since it uses as much as digits as its factorization.

1211100131999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4374, while the sum is 38.

The spelling of 1211100131999 in words is "one trillion, two hundred eleven billion, one hundred million, one hundred thirty-one thousand, nine hundred ninety-nine".