4221681 has 16 divisors (see below), whose sum is σ = 5836800. Its totient is φ = 2712528.

The previous prime is 4221677. The next prime is 4221683. The reversal of 4221681 is 1861224.

It is not a de Polignac number, because 4221681 - 2² = 4221677 is a prime.

It is a super-2 number, since 2×4221681² = 35645180931522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10950 + ... + 11328.

It is an arithmetic number, because the mean of its divisors is an integer number (364800).

Almost surely, 2^4221681 is an apocalyptic number.

It is an amenable number.

4221681 is a deficient number, since it is larger than the sum of its proper divisors (1615119).

4221681 is a wasteful number, since it uses less digits than its factorization.

4221681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508.

The product of its digits is 768, while the sum is 24.

The square root of 4221681 is about 2054.6729666786. The cubic root of 4221681 is about 161.6200132265.

The spelling of 4221681 in words is "four million, two hundred twenty-one thousand, six hundred eighty-one".