4221731 has 8 divisors (see below), whose sum is σ = 4332384. Its totient is φ = 4112640.

The previous prime is 4221713. The next prime is 4221751. The reversal of 4221731 is 1371224.

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

It is a cyclic number.

It is not a de Polignac number, because 4221731 - 2¹⁴ = 4205347 is a prime.

It is a super-2 number, since 2×4221731² = 35646025272722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4221751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6581 + ... + 7193.

It is an arithmetic number, because the mean of its divisors is an integer number (541548).

Almost surely, 2^4221731 is an apocalyptic number.

4221731 is a deficient number, since it is larger than the sum of its proper divisors (110653).

4221731 is an equidigital number, since it uses as much as digits as its factorization.

4221731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781.

The product of its digits is 336, while the sum is 20.

The square root of 4221731 is about 2054.6851340291. The cubic root of 4221731 is about 161.6206512795.

Adding to 4221731 its reverse (1371224), we get a palindrome (5592955).

The spelling of 4221731 in words is "four million, two hundred twenty-one thousand, seven hundred thirty-one".