131433021 has 24 divisors (see below), whose sum is σ = 192451584. Its totient is φ = 86430240.

The previous prime is 131433007. The next prime is 131433023. The reversal of 131433021 is 120334131.

131433021 is a `hidden beast` number, since 1 + 314 + 330 + 21 = 666.

It is not a de Polignac number, because 131433021 - 2⁶ = 131432957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131432985 and 131433003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131433023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 269640 + ... + 270126.

It is an arithmetic number, because the mean of its divisors is an integer number (8018816).

Almost surely, 2^131433021 is an apocalyptic number.

It is an amenable number.

131433021 is a deficient number, since it is larger than the sum of its proper divisors (61018563).

131433021 is a wasteful number, since it uses less digits than its factorization.

131433021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841 (or 838 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 131433021 is about 11464.4241460267. The cubic root of 131433021 is about 508.4342869519.

Adding to 131433021 its reverse (120334131), we get a palindrome (251767152).

The spelling of 131433021 in words is "one hundred thirty-one million, four hundred thirty-three thousand, twenty-one".