131401021 has 4 divisors (see below), whose sum is σ = 131428000. Its totient is φ = 131374044.

The previous prime is 131401019. The next prime is 131401027. The reversal of 131401021 is 120104131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120104131 = 7 ⋅17157733.

It is a cyclic number.

It is not a de Polignac number, because 131401021 - 2¹ = 131401019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131400992 and 131401010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131401027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3921 + ... + 16678.

It is an arithmetic number, because the mean of its divisors is an integer number (32857000).

Almost surely, 2^131401021 is an apocalyptic number.

It is an amenable number.

131401021 is a deficient number, since it is larger than the sum of its proper divisors (26979).

131401021 is an equidigital number, since it uses as much as digits as its factorization.

131401021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26978.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 131401021 is about 11463.0284392913. The cubic root of 131401021 is about 508.3930207676.

Adding to 131401021 its reverse (120104131), we get a palindrome (251505152).

It can be divided in two parts, 13140 and 1021, that added together give a square (14161 = 119²).

The spelling of 131401021 in words is "one hundred thirty-one million, four hundred one thousand, twenty-one".