131011223021 has 12 divisors (see below), whose sum is σ = 152410953888. Its totient is φ = 112287859992.

The previous prime is 131011223009. The next prime is 131011223029. The reversal of 131011223021 is 120322110131.

It is not a de Polignac number, because 131011223021 - 2¹⁸ = 131010960877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131011223029) 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 11 ways as a sum of consecutive naturals, for example, 731090 + ... + 892476.

It is an arithmetic number, because the mean of its divisors is an integer number (12700912824).

Almost surely, 2^131011223021 is an apocalyptic number.

It is an amenable number.

131011223021 is a deficient number, since it is larger than the sum of its proper divisors (21399730867).

131011223021 is a wasteful number, since it uses less digits than its factorization.

131011223021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177968 (or 177961 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 131011223021 its reverse (120322110131), we get a palindrome (251333333152).

The spelling of 131011223021 in words is "one hundred thirty-one billion, eleven million, two hundred twenty-three thousand, twenty-one".