131221131023 has 16 divisors (see below), whose sum is σ = 143057772000. Its totient is φ = 119887552512.

The previous prime is 131221131017. The next prime is 131221131029. The reversal of 131221131023 is 320131122131.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (131221131017) and next prime (131221131029).

It is a cyclic number.

It is not a de Polignac number, because 131221131023 - 2¹⁴ = 131221114639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131221130986 and 131221131004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221131029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 333263 + ... + 611151.

It is an arithmetic number, because the mean of its divisors is an integer number (8941110750).

Almost surely, 2^131221131023 is an apocalyptic number.

131221131023 is a deficient number, since it is larger than the sum of its proper divisors (11836640977).

131221131023 is a wasteful number, since it uses less digits than its factorization.

131221131023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278794.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 131221131023 its reverse (320131122131), we get a palindrome (451352253154).

The spelling of 131221131023 in words is "one hundred thirty-one billion, two hundred twenty-one million, one hundred thirty-one thousand, twenty-three".