1211220112099 has 4 divisors (see below), whose sum is σ = 1220757278464. Its totient is φ = 1201682945736.

The previous prime is 1211220112097. The next prime is 1211220112121. The reversal of 1211220112099 is 9902110221121.

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 1211220112099 - 2¹ = 1211220112097 is a prime.

It is a super-2 number, since 2×1211220112099² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211220112099.

It is not an unprimeable number, because it can be changed into a prime (1211220112097) 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, 4768582992 + ... + 4768583245.

It is an arithmetic number, because the mean of its divisors is an integer number (305189319616).

Almost surely, 2^{1211220112099} is an apocalyptic number.

1211220112099 is a deficient number, since it is larger than the sum of its proper divisors (9537166365).

1211220112099 is an equidigital number, since it uses as much as digits as its factorization.

1211220112099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9537166364.

The product of its (nonzero) digits is 1296, while the sum is 31.

The spelling of 1211220112099 in words is "one trillion, two hundred eleven billion, two hundred twenty million, one hundred twelve thousand, ninety-nine".