4221981 has 12 divisors (see below), whose sum is σ = 6202560. Its totient is φ = 2766600.

The previous prime is 4221977. The next prime is 4221989. The reversal of 4221981 is 1891224.

It is not a de Polignac number, because 4221981 - 2² = 4221977 is a prime.

It is a super-2 number, since 2×4221981² = 35650247128722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3445 + ... + 4506.

It is an arithmetic number, because the mean of its divisors is an integer number (516880).

Almost surely, 2^4221981 is an apocalyptic number.

It is an amenable number.

4221981 is a deficient number, since it is larger than the sum of its proper divisors (1980579).

4221981 is a wasteful number, since it uses less digits than its factorization.

4221981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8016 (or 8013 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 4221981 is about 2054.7459697004. The cubic root of 4221981 is about 161.6238414690.

The spelling of 4221981 in words is "four million, two hundred twenty-one thousand, nine hundred eighty-one".