131133021 has 4 divisors (see below), whose sum is σ = 174844032. Its totient is φ = 87422012.

The previous prime is 131133001. The next prime is 131133031. The reversal of 131133021 is 120331131.

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: 120331131 = 3 ⋅40110377.

It is a cyclic number.

It is not a de Polignac number, because 131133021 - 2¹⁴ = 131116637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131133001) 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, 21855501 + ... + 21855506.

It is an arithmetic number, because the mean of its divisors is an integer number (43711008).

Almost surely, 2^131133021 is an apocalyptic number.

It is an amenable number.

131133021 is a deficient number, since it is larger than the sum of its proper divisors (43711011).

131133021 is an equidigital number, since it uses as much as digits as its factorization.

131133021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43711010.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 131133021 is about 11451.3327171993. The cubic root of 131133021 is about 508.0471531757.

Adding to 131133021 its reverse (120331131), we get a palindrome (251464152).

The spelling of 131133021 in words is "one hundred thirty-one million, one hundred thirty-three thousand, twenty-one".