221100022221 has 16 divisors (see below), whose sum is σ = 318213584640. Its totient is φ = 135745853760.

The previous prime is 221100022219. The next prime is 221100022267. The reversal of 221100022221 is 122220001122.

It is not a de Polignac number, because 221100022221 - 2¹ = 221100022219 is a prime.

It is a super-2 number, since 2×221100022221² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221100022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100022201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6560026 + ... + 6593643.

It is an arithmetic number, because the mean of its divisors is an integer number (19888349040).

Almost surely, 2^221100022221 is an apocalyptic number.

It is an amenable number.

221100022221 is a deficient number, since it is larger than the sum of its proper divisors (97113562419).

221100022221 is a wasteful number, since it uses less digits than its factorization.

221100022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13154116.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221100022221 its reverse (122220001122), we get a palindrome (343320023343).

The spelling of 221100022221 in words is "two hundred twenty-one billion, one hundred million, twenty-two thousand, two hundred twenty-one".