1211820191120 has 80 divisors (see below), whose sum is σ = 3512704779648. Its totient is φ = 377710187520.

The previous prime is 1211820191093. The next prime is 1211820191201. The reversal of 1211820191120 is 211910281121.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1211820191120² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98355869 + ... + 98368188.

Almost surely, 2^{1211820191120} is an apocalyptic number.

1211820191120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211820191120 is an abundant number, since it is smaller than the sum of its proper divisors (2300884588528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211820191120 is a wasteful number, since it uses less digits than its factorization.

1211820191120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196724088 (or 196724082 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 29.

Subtracting from 1211820191120 its reverse (211910281121), we obtain a palindrome (999909909999).

The spelling of 1211820191120 in words is "one trillion, two hundred eleven billion, eight hundred twenty million, one hundred ninety-one thousand, one hundred twenty".