43222421 has 4 divisors (see below), whose sum is σ = 47151744. Its totient is φ = 39293100.

The previous prime is 43222411. The next prime is 43222447. The reversal of 43222421 is 12422234.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 43222421 - 2⁶ = 43222357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43222393 and 43222402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43222411) 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, 1964645 + ... + 1964666.

It is an arithmetic number, because the mean of its divisors is an integer number (11787936).

Almost surely, 2^43222421 is an apocalyptic number.

It is an amenable number.

43222421 is a deficient number, since it is larger than the sum of its proper divisors (3929323).

43222421 is a wasteful number, since it uses less digits than its factorization.

43222421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3929322.

The product of its digits is 768, while the sum is 20.

The square root of 43222421 is about 6574.3760920714. The cubic root of 43222421 is about 350.9428212366.

Adding to 43222421 its reverse (12422234), we get a palindrome (55644655).

The spelling of 43222421 in words is "forty-three million, two hundred twenty-two thousand, four hundred twenty-one".