4221101021 has 4 divisors (see below), whose sum is σ = 4227686844. Its totient is φ = 4214515200.

The previous prime is 4221101011. The next prime is 4221101029. The reversal of 4221101021 is 1201011224.

It is a happy number.

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 3810592900 + 410508121 = 61730^2 + 20261^2 .

It is a cyclic number.

It is not a de Polignac number, because 4221101021 - 2³⁰ = 3147359197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4221100987 and 4221101005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221101029) 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, 3291950 + ... + 3293231.

It is an arithmetic number, because the mean of its divisors is an integer number (1056921711).

Almost surely, 2^4221101021 is an apocalyptic number.

It is an amenable number.

4221101021 is a deficient number, since it is larger than the sum of its proper divisors (6585823).

4221101021 is an equidigital number, since it uses as much as digits as its factorization.

4221101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6585822.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 4221101021 is about 64970.0009311990. Note that the first 3 decimals coincide. The cubic root of 4221101021 is about 1616.1261171147.

Adding to 4221101021 its reverse (1201011224), we get a palindrome (5422112245).

The spelling of 4221101021 in words is "four billion, two hundred twenty-one million, one hundred one thousand, twenty-one".