5821221 has 16 divisors (see below), whose sum is σ = 9088128. Its totient is φ = 3244800.

The previous prime is 5821213. The next prime is 5821229. The reversal of 5821221 is 1221285.

5821221 = T₃₉₈ + T₃₉₉ + ... + T₄₆₀.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (5821213) and next prime (5821229).

It is not a de Polignac number, because 5821221 - 2³ = 5821213 is a prime.

It is a super-2 number, since 2×5821221² = 67773227861682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5821229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2520 + ... + 4241.

It is an arithmetic number, because the mean of its divisors is an integer number (568008).

Almost surely, 2^5821221 is an apocalyptic number.

It is an amenable number.

5821221 is a deficient number, since it is larger than the sum of its proper divisors (3266907).

5821221 is a wasteful number, since it uses less digits than its factorization.

5821221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6812.

The product of its digits is 320, while the sum is 21.

The square root of 5821221 is about 2412.7206634834. The cubic root of 5821221 is about 179.8890365474.

The spelling of 5821221 in words is "five million, eight hundred twenty-one thousand, two hundred twenty-one".