6220021 has 4 divisors (see below), whose sum is σ = 6225472. Its totient is φ = 6214572.

The previous prime is 6220003. The next prime is 6220043. The reversal of 6220021 is 1200226.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6220021 - 2⁵ = 6219989 is a prime.

It is a super-2 number, since 2×6220021² = 77377322480882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6219983 and 6220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6220001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285 + ... + 3538.

It is an arithmetic number, because the mean of its divisors is an integer number (1556368).

Almost surely, 2^6220021 is an apocalyptic number.

It is an amenable number.

6220021 is a deficient number, since it is larger than the sum of its proper divisors (5451).

6220021 is a wasteful number, since it uses less digits than its factorization.

6220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5450.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 6220021 is about 2493.9969927809. The cubic root of 6220021 is about 183.9065865629.

Adding to 6220021 its reverse (1200226), we get a palindrome (7420247).

The spelling of 6220021 in words is "six million, two hundred twenty thousand, twenty-one".