1201201111111 has 4 divisors (see below), whose sum is σ = 1203421446424. Its totient is φ = 1198980775800.

The previous prime is 1201201111091. The next prime is 1201201111127. The reversal of 1201201111111 is 1111111021021.

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 1201201111111 - 2²⁵ = 1201167556679 is a prime.

It is a Duffinian number.

1201201111111 is a modest number, since divided by 1111111 gives 120120 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1201201111091 and 1201201111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201201118111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1110166845 + ... + 1110167926.

It is an arithmetic number, because the mean of its divisors is an integer number (300855361606).

Almost surely, 2^{1201201111111} is an apocalyptic number.

1201201111111 is a deficient number, since it is larger than the sum of its proper divisors (2220335313).

1201201111111 is an equidigital number, since it uses as much as digits as its factorization.

1201201111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2220335312.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 1201201111111 its reverse (1111111021021), we get a palindrome (2312312132132).

The spelling of 1201201111111 in words is "one trillion, two hundred one billion, two hundred one million, one hundred eleven thousand, one hundred eleven".