131001111221 has 4 divisors (see below), whose sum is σ = 131389838892. Its totient is φ = 130612383552.

The previous prime is 131001111211. The next prime is 131001111233. The reversal of 131001111221 is 122111100131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 75158222500 + 55842888721 = 274150^2 + 236311^2 .

It is a cyclic number.

It is not a de Polignac number, because 131001111221 - 2³⁴ = 113821242037 is a prime.

It is a super-2 number, since 2×131001111221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131001111196 and 131001111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131001111211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194363330 + ... + 194364003.

It is an arithmetic number, because the mean of its divisors is an integer number (32847459723).

Almost surely, 2^131001111221 is an apocalyptic number.

It is an amenable number.

131001111221 is a deficient number, since it is larger than the sum of its proper divisors (388727671).

131001111221 is an equidigital number, since it uses as much as digits as its factorization.

131001111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388727670.

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

Adding to 131001111221 its reverse (122111100131), we get a palindrome (253112211352).

The spelling of 131001111221 in words is "one hundred thirty-one billion, one million, one hundred eleven thousand, two hundred twenty-one".