4021022221 has 16 divisors (see below), whose sum is σ = 4123440000. Its totient is φ = 3919910976.

The previous prime is 4021022209. The next prime is 4021022263. The reversal of 4021022221 is 1222201204.

It is a cyclic number.

It is not a de Polignac number, because 4021022221 - 2¹¹ = 4021020173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4021022195 and 4021022204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021022821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4850035 + ... + 4850863.

It is an arithmetic number, because the mean of its divisors is an integer number (257715000).

Almost surely, 2^4021022221 is an apocalyptic number.

It is an amenable number.

4021022221 is a deficient number, since it is larger than the sum of its proper divisors (102417779).

4021022221 is a wasteful number, since it uses less digits than its factorization.

4021022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1476.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 4021022221 is about 63411.5306628061. The cubic root of 4021022221 is about 1590.1770857443.

Adding to 4021022221 its reverse (1222201204), we get a palindrome (5243223425).

The spelling of 4021022221 in words is "four billion, twenty-one million, twenty-two thousand, two hundred twenty-one".