131021 has 8 divisors (see below), whose sum is σ = 146784. Its totient is φ = 115920.

The previous prime is 131011. The next prime is 131023. The reversal of 131021 is 120131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131021 - 2⁶ = 130957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335 + ... + 611.

It is an arithmetic number, because the mean of its divisors is an integer number (18348).

2¹³¹⁰²¹ is an apocalyptic number.

131021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131021 is a deficient number, since it is larger than the sum of its proper divisors (15763).

131021 is a wasteful number, since it uses less digits than its factorization.

131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 131021 is about 361.9682306501. The cubic root of 131021 is about 50.7902444738.

Adding to 131021 its reverse (120131), we get a palindrome (251152).

It can be divided in two parts, 1310 and 21, that added together give a palindrome (1331).

The spelling of 131021 in words is "one hundred thirty-one thousand, twenty-one".