43421031 has 6 divisors (see below), whose sum is σ = 62719280. Its totient is φ = 28947348.

The previous prime is 43420969. The next prime is 43421039. The reversal of 43421031 is 13012434.

It is not a de Polignac number, because 43421031 - 2¹⁰ = 43420007 is a prime.

It is a super-2 number, since 2×43421031² = 3770771866205922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43420995 and 43421013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43421039) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2412271 + ... + 2412288.

Almost surely, 2^43421031 is an apocalyptic number.

43421031 is a deficient number, since it is larger than the sum of its proper divisors (19298249).

43421031 is a wasteful number, since it uses less digits than its factorization.

43421031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4824565 (or 4824562 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 43421031 is about 6589.4636352286. The cubic root of 43421031 is about 351.4795354688.

Adding to 43421031 its reverse (13012434), we get a palindrome (56433465).

The spelling of 43421031 in words is "forty-three million, four hundred twenty-one thousand, thirty-one".