4222021 has 4 divisors (see below), whose sum is σ = 4229344. Its totient is φ = 4214700.

The previous prime is 4222013. The next prime is 4222037. The reversal of 4222021 is 1202224.

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.

It is a cyclic number.

It is not a de Polignac number, because 4222021 - 2³ = 4222013 is a prime.

It is a super-2 number, since 2×4222021² = 35650922648882, 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 = 4221992 and 4222010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4222051) 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, 2715 + ... + 3976.

It is an arithmetic number, because the mean of its divisors is an integer number (1057336).

Almost surely, 2^4222021 is an apocalyptic number.

It is an amenable number.

4222021 is a deficient number, since it is larger than the sum of its proper divisors (7323).

4222021 is an equidigital number, since it uses as much as digits as its factorization.

4222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7322.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 4222021 is about 2054.7557032407. The cubic root of 4222021 is about 161.6243518876.

Adding to 4222021 its reverse (1202224), we get a palindrome (5424245).

The spelling of 4222021 in words is "four million, two hundred twenty-two thousand, twenty-one".