43150021 has 4 divisors (see below), whose sum is σ = 43310700. Its totient is φ = 42989344.

The previous prime is 43150013. The next prime is 43150031. The reversal of 43150021 is 12005134.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6305121 + 36844900 = 2511^2 + 6070^2 .

It is a cyclic number.

It is not a de Polignac number, because 43150021 - 2³ = 43150013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43149977 and 43150004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43150031) 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, 79936 + ... + 80473.

It is an arithmetic number, because the mean of its divisors is an integer number (10827675).

Almost surely, 2^43150021 is an apocalyptic number.

It is an amenable number.

43150021 is a deficient number, since it is larger than the sum of its proper divisors (160679).

43150021 is a wasteful number, since it uses less digits than its factorization.

43150021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160678.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 43150021 is about 6568.8675584152. The cubic root of 43150021 is about 350.7467620336.

Adding to 43150021 its reverse (12005134), we get a palindrome (55155155).

The spelling of 43150021 in words is "forty-three million, one hundred fifty thousand, twenty-one".