131121211 has 16 divisors (see below), whose sum is σ = 146409984. Its totient is φ = 116655264.

The previous prime is 131121181. The next prime is 131121241. The reversal of 131121211 is 112121131.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (131121181) and next prime (131121241).

It is a cyclic number.

It is not a de Polignac number, because 131121211 - 2¹³ = 131113019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131121191 and 131121200.

It is not an unprimeable number, because it can be changed into a prime (131121241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39336 + ... + 42538.

It is an arithmetic number, because the mean of its divisors is an integer number (9150624).

Almost surely, 2^131121211 is an apocalyptic number.

131121211 is a deficient number, since it is larger than the sum of its proper divisors (15288773).

131121211 is a wasteful number, since it uses less digits than its factorization.

131121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3330.

The product of its digits is 12, while the sum is 13.

The square root of 131121211 is about 11450.8170450846. The cubic root of 131121211 is about 508.0319009355.

Adding to 131121211 its reverse (112121131), we get a palindrome (243242342).

It can be divided in two parts, 1311 and 21211, that added together give a palindrome (22522).

The spelling of 131121211 in words is "one hundred thirty-one million, one hundred twenty-one thousand, two hundred eleven".