221655006321340 has 24 divisors (see below), whose sum is σ = 465495463490400. Its totient is φ = 88658202487488.

The previous prime is 221655006321317. The next prime is 221655006321341. The reversal of 221655006321340 is 43123600556122.

It is a junction number, because it is equal to n+sod(n) for n = 221655006321293 and 221655006321302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221655006321341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 237024240 + ... + 237957559.

It is an arithmetic number, because the mean of its divisors is an integer number (19395644312100).

Almost surely, 2^{221655006321340} is an apocalyptic number.

221655006321340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221655006321340 is an abundant number, since it is smaller than the sum of its proper divisors (243840457169060).

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

221655006321340 is a wasteful number, since it uses less digits than its factorization.

221655006321340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475005141 (or 475005139 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

Adding to 221655006321340 its reverse (43123600556122), we get a palindrome (264778606877462).

The spelling of 221655006321340 in words is "two hundred twenty-one trillion, six hundred fifty-five billion, six million, three hundred twenty-one thousand, three hundred forty".