221701812438 has 24 divisors (see below), whose sum is σ = 447509012328. Its totient is φ = 73222593408.

The previous prime is 221701812419. The next prime is 221701812463. The reversal of 221701812438 is 834218107122.

221701812438 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221701812396 and 221701812405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1483731 + ... + 1626302.

It is an arithmetic number, because the mean of its divisors is an integer number (18646208847).

Almost surely, 2^221701812438 is an apocalyptic number.

221701812438 is an abundant number, since it is smaller than the sum of its proper divisors (225807199890).

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

221701812438 is a wasteful number, since it uses less digits than its factorization.

221701812438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110256 (or 3110147 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The spelling of 221701812438 in words is "two hundred twenty-one billion, seven hundred one million, eight hundred twelve thousand, four hundred thirty-eight".