131012321 has 4 divisors (see below), whose sum is σ = 142922544. Its totient is φ = 119102100.

The previous prime is 131012317. The next prime is 131012327. The reversal of 131012321 is 123210131.

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: 123210131 = 11 ⋅11200921.

It is a cyclic number.

It is not a de Polignac number, because 131012321 - 2² = 131012317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131012296 and 131012305.

It is not an unprimeable number, because it can be changed into a prime (131012327) 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, 5955095 + ... + 5955116.

It is an arithmetic number, because the mean of its divisors is an integer number (35730636).

Almost surely, 2^131012321 is an apocalyptic number.

131012321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131012321 is a deficient number, since it is larger than the sum of its proper divisors (11910223).

131012321 is a wasteful number, since it uses less digits than its factorization.

131012321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11910222.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 131012321 is about 11446.0613749883. The cubic root of 131012321 is about 507.8912297865.

Adding to 131012321 its reverse (123210131), we get a palindrome (254222452).

It can be divided in two parts, 1310 and 12321, that added together give a palindrome (13631).

The spelling of 131012321 in words is "one hundred thirty-one million, twelve thousand, three hundred twenty-one".