221154504342 has 32 divisors (see below), whose sum is σ = 463928504832. Its totient is φ = 70199701344.

The previous prime is 221154504317. The next prime is 221154504353. The reversal of 221154504342 is 243405451122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10587348 + ... + 10608215.

It is an arithmetic number, because the mean of its divisors is an integer number (14497765776).

Almost surely, 2^221154504342 is an apocalyptic number.

221154504342 is an abundant number, since it is smaller than the sum of its proper divisors (242774000490).

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

221154504342 is a wasteful number, since it uses less digits than its factorization.

221154504342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21195652.

The product of its (nonzero) digits is 38400, while the sum is 33.

Adding to 221154504342 its reverse (243405451122), we get a palindrome (464559955464).

The spelling of 221154504342 in words is "two hundred twenty-one billion, one hundred fifty-four million, five hundred four thousand, three hundred forty-two".