131012021 has 4 divisors (see below), whose sum is σ = 149728032. Its totient is φ = 112296012.

The previous prime is 131012009. The next prime is 131012029. The reversal of 131012021 is 120210131.

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: 120210131 = 19 ⋅6326849.

It is a cyclic number.

It is not a de Polignac number, because 131012021 - 2¹⁴ = 130995637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131011993 and 131012011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131012029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9357995 + ... + 9358008.

It is an arithmetic number, because the mean of its divisors is an integer number (37432008).

Almost surely, 2^131012021 is an apocalyptic number.

It is an amenable number.

131012021 is a deficient number, since it is larger than the sum of its proper divisors (18716011).

131012021 is an equidigital number, since it uses as much as digits as its factorization.

131012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18716010.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 131012021 is about 11446.0482700363. The cubic root of 131012021 is about 507.8908421195.

Adding to 131012021 its reverse (120210131), we get a palindrome (251222152).

It can be divided in two parts, 1310 and 12021, that added together give a palindrome (13331).

The spelling of 131012021 in words is "one hundred thirty-one million, twelve thousand, twenty-one".