221506221324 has 48 divisors (see below), whose sum is σ = 534912297696. Its totient is φ = 71291904000.

The previous prime is 221506221319. The next prime is 221506221331. The reversal of 221506221324 is 423122605122.

It is a junction number, because it is equal to n+sod(n) for n = 221506221291 and 221506221300.

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, 2272977 + ... + 2368424.

It is an arithmetic number, because the mean of its divisors is an integer number (11144006202).

Almost surely, 2^221506221324 is an apocalyptic number.

It is an amenable number.

221506221324 is an abundant number, since it is smaller than the sum of its proper divisors (313406076372).

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

221506221324 is a wasteful number, since it uses less digits than its factorization.

221506221324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4641546 (or 4641544 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 221506221324 its reverse (423122605122), we get a palindrome (644628826446).

The spelling of 221506221324 in words is "two hundred twenty-one billion, five hundred six million, two hundred twenty-one thousand, three hundred twenty-four".