131221212201 has 6 divisors (see below), whose sum is σ = 189541750970. Its totient is φ = 87480808128.

The previous prime is 131221212181. The next prime is 131221212203. The reversal of 131221212201 is 102212122131.

131221212201 is a `hidden beast` number, since 1 + 31 + 221 + 212 + 201 = 666.

It can be written as a sum of positive squares in only one way, i.e., 117817130025 + 13404082176 = 343245^2 + 115776^2 .

It is not a de Polignac number, because 131221212201 - 2⁵ = 131221212169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131221212203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7290067336 + ... + 7290067353.

Almost surely, 2^131221212201 is an apocalyptic number.

It is an amenable number.

131221212201 is a deficient number, since it is larger than the sum of its proper divisors (58320538769).

131221212201 is a wasteful number, since it uses less digits than its factorization.

131221212201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14580134695 (or 14580134692 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 131221212201 its reverse (102212122131), we get a palindrome (233433334332).

The spelling of 131221212201 in words is "one hundred thirty-one billion, two hundred twenty-one million, two hundred twelve thousand, two hundred one".