131121322021 has 2 divisors, whose sum is σ = 131121322022. Its totient is φ = 131121322020.

The previous prime is 131121321983. The next prime is 131121322043. The reversal of 131121322021 is 120223121131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127927828900 + 3193493121 = 357670^2 + 56511^2 .

It is an emirp because it is prime and its reverse (120223121131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131121322021 - 2⁷ = 131121321893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131121322021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131121322091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65560661010 + 65560661011.

It is an arithmetic number, because the mean of its divisors is an integer number (65560661011).

Almost surely, 2^131121322021 is an apocalyptic number.

It is an amenable number.

131121322021 is a deficient number, since it is larger than the sum of its proper divisors (1).

131121322021 is an equidigital number, since it uses as much as digits as its factorization.

131121322021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 131121322021 its reverse (120223121131), we get a palindrome (251344443152).

The spelling of 131121322021 in words is "one hundred thirty-one billion, one hundred twenty-one million, three hundred twenty-two thousand, twenty-one".