4221340021 has 8 divisors (see below), whose sum is σ = 4368360600. Its totient is φ = 4074416640.

The previous prime is 4221340007. The next prime is 4221340031. The reversal of 4221340021 is 1200431224.

It can be written as a sum of positive squares in 4 ways, for example, as 27352900 + 4193987121 = 5230^2 + 64761^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4221340021 - 2⁷ = 4221339893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221340031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70381 + ... + 115741.

It is an arithmetic number, because the mean of its divisors is an integer number (546045075).

Almost surely, 2^4221340021 is an apocalyptic number.

It is an amenable number.

4221340021 is a deficient number, since it is larger than the sum of its proper divisors (147020579).

4221340021 is a wasteful number, since it uses less digits than its factorization.

4221340021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48599.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 4221340021 is about 64971.8402155888. The cubic root of 4221340021 is about 1616.1566183868.

Adding to 4221340021 its reverse (1200431224), we get a palindrome (5421771245).

The spelling of 4221340021 in words is "four billion, two hundred twenty-one million, three hundred forty thousand, twenty-one".