131002221 has 16 divisors (see below), whose sum is σ = 211365504. Its totient is φ = 70454784.

The previous prime is 131002211. The next prime is 131002231. The reversal of 131002221 is 122200131.

It is an interprime number because it is at equal distance from previous prime (131002211) and next prime (131002231).

It is not a de Polignac number, because 131002221 - 2²³ = 122613613 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 131002197 and 131002206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131002211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183120 + ... + 183833.

It is an arithmetic number, because the mean of its divisors is an integer number (13210344).

Almost surely, 2^131002221 is an apocalyptic number.

It is an amenable number.

131002221 is a deficient number, since it is larger than the sum of its proper divisors (80363283).

131002221 is a wasteful number, since it uses less digits than its factorization.

131002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366980.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 131002221 is about 11445.6201666838. The cubic root of 131002221 is about 507.8781780033.

Adding to 131002221 its reverse (122200131), we get a palindrome (253202352).

The spelling of 131002221 in words is "one hundred thirty-one million, two thousand, two hundred twenty-one".