43402221 has 12 divisors (see below), whose sum is σ = 64386972. Its totient is φ = 28152576.

The previous prime is 43402217. The next prime is 43402237. The reversal of 43402221 is 12220434.

43402221 is a `hidden beast` number, since 43 + 402 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 42068196 + 1334025 = 6486^2 + 1155^2 .

It is not a de Polignac number, because 43402221 - 2² = 43402217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43402194 and 43402203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43402211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64836 + ... + 65501.

It is an arithmetic number, because the mean of its divisors is an integer number (5365581).

Almost surely, 2^43402221 is an apocalyptic number.

It is an amenable number.

43402221 is a deficient number, since it is larger than the sum of its proper divisors (20984751).

43402221 is a wasteful number, since it uses less digits than its factorization.

43402221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130380 (or 130377 counting only the distinct ones).

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

The square root of 43402221 is about 6588.0362020863. The cubic root of 43402221 is about 351.4287744680.

Adding to 43402221 its reverse (12220434), we get a palindrome (55622655).

It can be divided in two parts, 4340 and 2221, that added together give a 8-th power (6561 = 3⁸).

The spelling of 43402221 in words is "forty-three million, four hundred two thousand, two hundred twenty-one".