4006221 has 4 divisors (see below), whose sum is σ = 5341632. Its totient is φ = 2670812.

The previous prime is 4006201. The next prime is 4006229. The reversal of 4006221 is 1226004.

4006221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 4006221 - 2¹⁴ = 3989837 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 4006221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4006229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 667701 + ... + 667706.

It is an arithmetic number, because the mean of its divisors is an integer number (1335408).

Almost surely, 2^4006221 is an apocalyptic number.

It is an amenable number.

4006221 is a deficient number, since it is larger than the sum of its proper divisors (1335411).

4006221 is a wasteful number, since it uses less digits than its factorization.

4006221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335410.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 4006221 is about 2001.5546457691. The cubic root of 4006221 is about 158.8223560875.

The spelling of 4006221 in words is "four million, six thousand, two hundred twenty-one".