131110221220021 has 8 divisors (see below), whose sum is σ = 134843661389240. Its totient is φ = 127386776875968.

The previous prime is 131110221220001. The next prime is 131110221220039. The reversal of 131110221220021 is 120022122011131.

It can be written as a sum of positive squares in 4 ways, for example, as 36855462556900 + 94254758663121 = 6070870^2 + 9708489^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 131110221220021 - 2¹⁷ = 131110221088949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131110221220001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2498929686 + ... + 2498982151.

It is an arithmetic number, because the mean of its divisors is an integer number (16855457673655).

Almost surely, 2^{131110221220021} is an apocalyptic number.

It is an amenable number.

131110221220021 is a deficient number, since it is larger than the sum of its proper divisors (3733440169219).

131110221220021 is an equidigital number, since it uses as much as digits as its factorization.

131110221220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4997912583.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 131110221220021 its reverse (120022122011131), we get a palindrome (251132343231152).

The spelling of 131110221220021 in words is "one hundred thirty-one trillion, one hundred ten billion, two hundred twenty-one million, two hundred twenty thousand, twenty-one".