43242021 has 24 divisors (see below), whose sum is σ = 64306944. Its totient is φ = 27986400.

The previous prime is 43242013. The next prime is 43242037. The reversal of 43242021 is 12024234.

It is not a de Polignac number, because 43242021 - 2³ = 43242013 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 43241985 and 43242003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43242041) 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, 63535 + ... + 64211.

It is an arithmetic number, because the mean of its divisors is an integer number (2679456).

Almost surely, 2^43242021 is an apocalyptic number.

It is an amenable number.

43242021 is a deficient number, since it is larger than the sum of its proper divisors (21064923).

43242021 is a wasteful number, since it uses less digits than its factorization.

43242021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881 (or 878 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 43242021 is about 6575.8665588651. The cubic root of 43242021 is about 350.9958603744.

Adding to 43242021 its reverse (12024234), we get a palindrome (55266255).

It can be divided in two parts, 43 and 242021, that added together give a square (242064 = 492²).

The spelling of 43242021 in words is "forty-three million, two hundred forty-two thousand, twenty-one".