131101220321221 has 2 divisors, whose sum is σ = 131101220321222. Its totient is φ = 131101220321220.

The previous prime is 131101220321179. The next prime is 131101220321231. The reversal of 131101220321221 is 122123022101131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106119357030625 + 24981863290596 = 10301425^2 + 4998186^2 .

It is a cyclic number.

It is not a de Polignac number, because 131101220321221 - 2¹³ = 131101220313029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131101220321192 and 131101220321201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131101220321231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65550610160610 + 65550610160611.

It is an arithmetic number, because the mean of its divisors is an integer number (65550610160611).

Almost surely, 2^{131101220321221} is an apocalyptic number.

It is an amenable number.

131101220321221 is a deficient number, since it is larger than the sum of its proper divisors (1).

131101220321221 is an equidigital number, since it uses as much as digits as its factorization.

131101220321221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 131101220321221 its reverse (122123022101131), we get a palindrome (253224242422352).

The spelling of 131101220321221 in words is "one hundred thirty-one trillion, one hundred one billion, two hundred twenty million, three hundred twenty-one thousand, two hundred twenty-one".