4220231021 has 4 divisors (see below), whose sum is σ = 4220763132. Its totient is φ = 4219698912.

The previous prime is 4220230997. The next prime is 4220231111. The reversal of 4220231021 is 1201320224.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2821096996 + 1399134025 = 53114^2 + 37405^2 .

It is a cyclic number.

It is not a de Polignac number, because 4220231021 - 2⁶ = 4220230957 is a prime.

It is a super-2 number, since 2×4220231021² = 35620699741221404882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4220231621) 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, 253976 + ... + 270081.

It is an arithmetic number, because the mean of its divisors is an integer number (1055190783).

Almost surely, 2^4220231021 is an apocalyptic number.

It is an amenable number.

4220231021 is a deficient number, since it is larger than the sum of its proper divisors (532111).

4220231021 is an equidigital number, since it uses as much as digits as its factorization.

4220231021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532110.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 4220231021 is about 64963.3051883908. The cubic root of 4220231021 is about 1616.0150776550.

Adding to 4220231021 its reverse (1201320224), we get a palindrome (5421551245).

The spelling of 4220231021 in words is "four billion, two hundred twenty million, two hundred thirty-one thousand, twenty-one".