4021221000021 has 8 divisors (see below), whose sum is σ = 5370317837184. Its totient is φ = 2676469081440.

The previous prime is 4021220999977. The next prime is 4021221000053. The reversal of 4021221000021 is 1200001221204.

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

It is not a de Polignac number, because 4021221000021 - 2¹⁹ = 4021220475733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021221000421) 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, 1086227485 + ... + 1086231186.

It is an arithmetic number, because the mean of its divisors is an integer number (671289729648).

Almost surely, 2^{4021221000021} is an apocalyptic number.

It is an amenable number.

4021221000021 is a deficient number, since it is larger than the sum of its proper divisors (1349096837163).

4021221000021 is a wasteful number, since it uses less digits than its factorization.

4021221000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2172459291.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 4021221000021 its reverse (1200001221204), we get a palindrome (5221222221225).

The spelling of 4021221000021 in words is "four trillion, twenty-one billion, two hundred twenty-one million, twenty-one", and thus it is an aban number.