1221134311191 has 8 divisors (see below), whose sum is σ = 1628192749680. Its totient is φ = 814082706752.

The previous prime is 1221134311181. The next prime is 1221134311211. The reversal of 1221134311191 is 1911134311221.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221134311191 - 2⁶ = 1221134311127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221134311141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1275936 + ... + 2017493.

It is an arithmetic number, because the mean of its divisors is an integer number (203524093710).

Almost surely, 2^{1221134311191} is an apocalyptic number.

1221134311191 is a deficient number, since it is larger than the sum of its proper divisors (407058438489).

1221134311191 is a wasteful number, since it uses less digits than its factorization.

1221134311191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3417025.

The product of its digits is 1296, while the sum is 30.

Adding to 1221134311191 its sum of digits (30), we get a palindrome (1221134311221).

The spelling of 1221134311191 in words is "one trillion, two hundred twenty-one billion, one hundred thirty-four million, three hundred eleven thousand, one hundred ninety-one".