4245221 has 4 divisors (see below), whose sum is σ = 4249344. Its totient is φ = 4241100.

The previous prime is 4245217. The next prime is 4245239. The reversal of 4245221 is 1225424.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4245221 - 2² = 4245217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4245193 and 4245202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4245821) 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, 956 + ... + 3066.

It is an arithmetic number, because the mean of its divisors is an integer number (1062336).

Almost surely, 2^4245221 is an apocalyptic number.

It is an amenable number.

4245221 is a deficient number, since it is larger than the sum of its proper divisors (4123).

4245221 is a wasteful number, since it uses less digits than its factorization.

4245221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4122.

The product of its digits is 640, while the sum is 20.

The square root of 4245221 is about 2060.3934090362. The cubic root of 4245221 is about 161.9198531561.

The spelling of 4245221 in words is "four million, two hundred forty-five thousand, two hundred twenty-one".