131210121 has 16 divisors (see below), whose sum is σ = 200116224. Its totient is φ = 74910864.

The previous prime is 131210113. The next prime is 131210137. The reversal of 131210121 is 121012131.

It is not a de Polignac number, because 131210121 - 2³ = 131210113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131210097 and 131210106.

It is not an unprimeable number, because it can be changed into a prime (131210111) 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, 31270 + ... + 35216.

It is an arithmetic number, because the mean of its divisors is an integer number (12507264).

Almost surely, 2^131210121 is an apocalyptic number.

It is an amenable number.

131210121 is a deficient number, since it is larger than the sum of its proper divisors (68906103).

131210121 is a wasteful number, since it uses less digits than its factorization.

131210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5540.

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

The square root of 131210121 is about 11454.6986429151. The cubic root of 131210121 is about 508.1467028821.

Adding to 131210121 its reverse (121012131), we get a palindrome (252222252).

The spelling of 131210121 in words is "one hundred thirty-one million, two hundred ten thousand, one hundred twenty-one".