43112031021 has 12 divisors (see below), whose sum is σ = 62275061472. Its totient is φ = 28740371976.

The previous prime is 43112030917. The next prime is 43112031031. The reversal of 43112031021 is 12013021134.

43112031021 is a `hidden beast` number, since 4 + 311 + 20 + 310 + 21 = 666.

It is not a de Polignac number, because 43112031021 - 2⁷ = 43112030893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43112030985 and 43112031003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43112031031) 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 11 ways as a sum of consecutive naturals, for example, 280750 + ... + 406256.

It is an arithmetic number, because the mean of its divisors is an integer number (5189588456).

Almost surely, 2^43112031021 is an apocalyptic number.

It is an amenable number.

43112031021 is a deficient number, since it is larger than the sum of its proper divisors (19163030451).

43112031021 is a wasteful number, since it uses less digits than its factorization.

43112031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163680 (or 163677 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 43112031021 its reverse (12013021134), we get a palindrome (55125052155).

The spelling of 43112031021 in words is "forty-three billion, one hundred twelve million, thirty-one thousand, twenty-one".