131202221 has 4 divisors (see below), whose sum is σ = 131406912. Its totient is φ = 130997532.

The previous prime is 131202187. The next prime is 131202263. The reversal of 131202221 is 122202131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131202221 - 2¹⁰ = 131201197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131202196 and 131202205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131202271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101381 + ... + 102666.

It is an arithmetic number, because the mean of its divisors is an integer number (32851728).

Almost surely, 2^131202221 is an apocalyptic number.

It is an amenable number.

131202221 is a deficient number, since it is larger than the sum of its proper divisors (204691).

131202221 is an equidigital number, since it uses as much as digits as its factorization.

131202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204690.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 131202221 is about 11454.3538010662. The cubic root of 131202221 is about 508.1365043815.

Adding to 131202221 its reverse (122202131), we get a palindrome (253404352).

The spelling of 131202221 in words is "one hundred thirty-one million, two hundred two thousand, two hundred twenty-one".