131021121 has 32 divisors (see below), whose sum is σ = 218400768. Its totient is φ = 67875840.

The previous prime is 131021119. The next prime is 131021147. The reversal of 131021121 is 121120131.

It is not a de Polignac number, because 131021121 - 2¹ = 131021119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131021097 and 131021106.

It is not an unprimeable number, because it can be changed into a prime (131021021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132796 + ... + 133778.

It is an arithmetic number, because the mean of its divisors is an integer number (6825024).

Almost surely, 2^131021121 is an apocalyptic number.

131021121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131021121 is a deficient number, since it is larger than the sum of its proper divisors (87379647).

131021121 is a wasteful number, since it uses less digits than its factorization.

131021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581.

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

The square root of 131021121 is about 11446.4457802411. The cubic root of 131021121 is about 507.9026010905.

Adding to 131021121 its reverse (121120131), we get a palindrome (252141252).

The spelling of 131021121 in words is "one hundred thirty-one million, twenty-one thousand, one hundred twenty-one".