1211101012099 has 4 divisors (see below), whose sum is σ = 1321201104120. Its totient is φ = 1101000920080.

The previous prime is 1211101012087. The next prime is 1211101012169. The reversal of 1211101012099 is 9902101011121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1211101012099 - 2¹⁹ = 1211100487811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211101012049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55050045994 + ... + 55050046015.

It is an arithmetic number, because the mean of its divisors is an integer number (330300276030).

Almost surely, 2^{1211101012099} is an apocalyptic number.

1211101012099 is a deficient number, since it is larger than the sum of its proper divisors (110100092021).

1211101012099 is a wasteful number, since it uses less digits than its factorization.

1211101012099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110100092020.

The product of its (nonzero) digits is 324, while the sum is 28.

The spelling of 1211101012099 in words is "one trillion, two hundred eleven billion, one hundred one million, twelve thousand, ninety-nine".