4221382638078 has 80 divisors (see below), whose sum is σ = 9663789763584. Its totient is φ = 1376688292560.

The previous prime is 4221382638059. The next prime is 4221382638157. The reversal of 4221382638078 is 8708362831224.

4221382638078 is a `hidden beast` number, since 4 + 221 + 38 + 2 + 6 + 380 + 7 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 21151351 + ... + 21349997.

Almost surely, 2^{4221382638078} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4221382638078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4831894881792).

4221382638078 is an abundant number, since it is smaller than the sum of its proper divisors (5442407125506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4221382638078 is a wasteful number, since it uses less digits than its factorization.

4221382638078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201499 (or 201490 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 54.

The spelling of 4221382638078 in words is "four trillion, two hundred twenty-one billion, three hundred eighty-two million, six hundred thirty-eight thousand, seventy-eight".