4221145 has 8 divisors (see below), whose sum is σ = 5202504. Its totient is φ = 3285504.

The previous prime is 4221109. The next prime is 4221169. The reversal of 4221145 is 5411224.

It can be written as a sum of positive squares in 4 ways, for example, as 2653641 + 1567504 = 1629^2 + 1252^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4221145 is a prime.

It is a super-2 number, since 2×4221145² = 35636130222050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11224 + ... + 11593.

It is an arithmetic number, because the mean of its divisors is an integer number (650313).

Almost surely, 2^4221145 is an apocalyptic number.

It is an amenable number.

4221145 is a deficient number, since it is larger than the sum of its proper divisors (981359).

4221145 is a wasteful number, since it uses less digits than its factorization.

4221145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22859.

The product of its digits is 320, while the sum is 19.

The square root of 4221145 is about 2054.5425281556. The cubic root of 4221145 is about 161.6131729818.

Adding to 4221145 its reverse (5411224), we get a palindrome (9632369).

The spelling of 4221145 in words is "four million, two hundred twenty-one thousand, one hundred forty-five".