131030021031221 has 8 divisors (see below), whose sum is σ = 141109345210680. Its totient is φ = 120950709964992.

The previous prime is 131030021031211. The next prime is 131030021031229. The reversal of 131030021031221 is 122130120030131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1614142299121 + 129415878732100 = 1270489^2 + 11376110^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131030021031221 is a prime.

It is a super-2 number, since 2×131030021031221² (a number of 29 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 = 131030021031193 and 131030021031202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131030021031229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29944835 + ... + 34040463.

It is an arithmetic number, because the mean of its divisors is an integer number (17638668151335).

Almost surely, 2^{131030021031221} is an apocalyptic number.

It is an amenable number.

131030021031221 is a deficient number, since it is larger than the sum of its proper divisors (10079324179459).

131030021031221 is a wasteful number, since it uses less digits than its factorization.

131030021031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6556615.

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

Adding to 131030021031221 its reverse (122130120030131), we get a palindrome (253160141061352).

The spelling of 131030021031221 in words is "one hundred thirty-one trillion, thirty billion, twenty-one million, thirty-one thousand, two hundred twenty-one".