4221386440821 has 24 divisors (see below), whose sum is σ = 6669432862560. Its totient is φ = 2551665564000.

The previous prime is 4221386440781. The next prime is 4221386440841. The reversal of 4221386440821 is 1280446831224.

4221386440821 is a `hidden beast` number, since 4 + 2 + 213 + 8 + 6 + 4 + 408 + 21 = 666.

It is not a de Polignac number, because 4221386440821 - 2¹⁰ = 4221386439797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221386440841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56216130 + ... + 56291171.

It is an arithmetic number, because the mean of its divisors is an integer number (277893035940).

Almost surely, 2^{4221386440821} is an apocalyptic number.

It is an amenable number.

4221386440821 is a deficient number, since it is larger than the sum of its proper divisors (2448046421739).

4221386440821 is a wasteful number, since it uses less digits than its factorization.

4221386440821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112507697 (or 112507694 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 45.

The spelling of 4221386440821 in words is "four trillion, two hundred twenty-one billion, three hundred eighty-six million, four hundred forty thousand, eight hundred twenty-one".