4051221 has 8 divisors (see below), whose sum is σ = 5410944. Its totient is φ = 2696160.

The previous prime is 4051181. The next prime is 4051261. The reversal of 4051221 is 1221504.

It is an interprime number because it is at equal distance from previous prime (4051181) and next prime (4051261).

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

It is not a de Polignac number, because 4051221 - 2¹⁰ = 4050197 is a prime.

4051221 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 4051221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4051261) 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, 2676 + ... + 3906.

It is an arithmetic number, because the mean of its divisors is an integer number (676368).

Almost surely, 2^4051221 is an apocalyptic number.

It is an amenable number.

4051221 is a deficient number, since it is larger than the sum of its proper divisors (1359723).

4051221 is a wasteful number, since it uses less digits than its factorization.

4051221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 4051221 is about 2012.7645167779. The cubic root of 4051221 is about 159.4148023619.

Adding to 4051221 its reverse (1221504), we get a palindrome (5272725).

The spelling of 4051221 in words is "four million, fifty-one thousand, two hundred twenty-one".