4021421021221 has 16 divisors (see below), whose sum is σ = 4450840035840. Its totient is φ = 3616307426160.

The previous prime is 4021421021213. The next prime is 4021421021227. The reversal of 4021421021221 is 1221201241204.

4021421021221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 4021421021221 - 2³ = 4021421021213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4021421021192 and 4021421021201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021421021227) 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, 35066175 + ... + 35180668.

It is an arithmetic number, because the mean of its divisors is an integer number (278177502240).

Almost surely, 2^{4021421021221} is an apocalyptic number.

It is an amenable number.

4021421021221 is a deficient number, since it is larger than the sum of its proper divisors (429419014619).

4021421021221 is a wasteful number, since it uses less digits than its factorization.

4021421021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70247016.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 4021421021221 its reverse (1221201241204), we get a palindrome (5242622262425).

The spelling of 4021421021221 in words is "four trillion, twenty-one billion, four hundred twenty-one million, twenty-one thousand, two hundred twenty-one".