4221384375221 has 4 divisors (see below), whose sum is σ = 4546106250252. Its totient is φ = 3896662500192.

The previous prime is 4221384375211. The next prime is 4221384375239. The reversal of 4221384375221 is 1225734831224.

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 725179980625 + 3496204394596 = 851575^2 + 1869814^2 .

It is a cyclic number.

It is not a de Polignac number, because 4221384375221 - 2⁶ = 4221384375157 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 (4221384375211) 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, 162360937496 + ... + 162360937521.

It is an arithmetic number, because the mean of its divisors is an integer number (1136526562563).

Almost surely, 2^{4221384375221} is an apocalyptic number.

It is an amenable number.

4221384375221 is a deficient number, since it is larger than the sum of its proper divisors (324721875031).

4221384375221 is a wasteful number, since it uses less digits than its factorization.

4221384375221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324721875030.

The product of its digits is 645120, while the sum is 44.

The spelling of 4221384375221 in words is "four trillion, two hundred twenty-one billion, three hundred eighty-four million, three hundred seventy-five thousand, two hundred twenty-one".