221201221124 has 24 divisors (see below), whose sum is σ = 420775302528. Its totient is φ = 101138729760.

The previous prime is 221201221123. The next prime is 221201221133. The reversal of 221201221124 is 421122102122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221201221096 and 221201221105.

It is not an unprimeable number, because it can be changed into a prime (221201221123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19872332 + ... + 19883459.

It is an arithmetic number, because the mean of its divisors is an integer number (17532304272).

Almost surely, 2^221201221124 is an apocalyptic number.

It is an amenable number.

221201221124 is a deficient number, since it is larger than the sum of its proper divisors (199574081404).

221201221124 is a wasteful number, since it uses less digits than its factorization.

221201221124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39755915 (or 39755913 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221201221124 its reverse (421122102122), we get a palindrome (642323323246).

The spelling of 221201221124 in words is "two hundred twenty-one billion, two hundred one million, two hundred twenty-one thousand, one hundred twenty-four".