221200012221 has 16 divisors (see below), whose sum is σ = 295530312960. Its totient is φ = 147168290880.

The previous prime is 221200012219. The next prime is 221200012223. The reversal of 221200012221 is 122210002122.

It is an interprime number because it is at equal distance from previous prime (221200012219) and next prime (221200012223).

It is not a de Polignac number, because 221200012221 - 2¹ = 221200012219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221200012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200012223) 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, 15270060 + ... + 15284538.

It is an arithmetic number, because the mean of its divisors is an integer number (18470644560).

Almost surely, 2^221200012221 is an apocalyptic number.

It is an amenable number.

221200012221 is a deficient number, since it is larger than the sum of its proper divisors (74330300739).

221200012221 is a wasteful number, since it uses less digits than its factorization.

221200012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24436.

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

Adding to 221200012221 its reverse (122210002122), we get a palindrome (343410014343).

The spelling of 221200012221 in words is "two hundred twenty-one billion, two hundred million, twelve thousand, two hundred twenty-one".