131220111011 has 4 divisors (see below), whose sum is σ = 143149212024. Its totient is φ = 119291010000.

The previous prime is 131220110999. The next prime is 131220111023. The reversal of 131220111011 is 110111022131.

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

It is an interprime number because it is at equal distance from previous prime (131220110999) and next prime (131220111023).

It is a cyclic number.

It is not a de Polignac number, because 131220111011 - 2⁶ = 131220110947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131220111041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5964550490 + ... + 5964550511.

It is an arithmetic number, because the mean of its divisors is an integer number (35787303006).

Almost surely, 2^131220111011 is an apocalyptic number.

131220111011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131220111011 is a deficient number, since it is larger than the sum of its proper divisors (11929101013).

131220111011 is a wasteful number, since it uses less digits than its factorization.

131220111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11929101012.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 131220111011 its reverse (110111022131), we get a palindrome (241331133142).

The spelling of 131220111011 in words is "one hundred thirty-one billion, two hundred twenty million, one hundred eleven thousand, eleven".