43020421 has 8 divisors (see below), whose sum is σ = 45750744. Its totient is φ = 40312320.

The previous prime is 43020413. The next prime is 43020431. The reversal of 43020421 is 12402034.

It can be written as a sum of positive squares in 4 ways, for example, as 4456321 + 38564100 = 2111^2 + 6210^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43020421 - 2³ = 43020413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43020395 and 43020404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43020431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1470 + ... + 9391.

It is an arithmetic number, because the mean of its divisors is an integer number (5718843).

Almost surely, 2^43020421 is an apocalyptic number.

It is an amenable number.

43020421 is a deficient number, since it is larger than the sum of its proper divisors (2730323).

43020421 is a wasteful number, since it uses less digits than its factorization.

43020421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11111.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 43020421 is about 6558.9954261304. The cubic root of 43020421 is about 350.3952568676.

Adding to 43020421 its reverse (12402034), we get a palindrome (55422455).

The spelling of 43020421 in words is "forty-three million, twenty thousand, four hundred twenty-one".