221021200221 has 16 divisors (see below), whose sum is σ = 306134494848. Its totient is φ = 141728921600.

The previous prime is 221021200181. The next prime is 221021200229. The reversal of 221021200221 is 122002120122.

It is a cyclic number.

It is not a de Polignac number, because 221021200221 - 2⁹ = 221021199709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221021200221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021200229) 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, 12645636 + ... + 12663101.

It is an arithmetic number, because the mean of its divisors is an integer number (19133405928).

Almost surely, 2^221021200221 is an apocalyptic number.

It is an amenable number.

221021200221 is a deficient number, since it is larger than the sum of its proper divisors (85113294627).

221021200221 is a wasteful number, since it uses less digits than its factorization.

221021200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25308852.

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

Adding to 221021200221 its reverse (122002120122), we get a palindrome (343023320343).

The spelling of 221021200221 in words is "two hundred twenty-one billion, twenty-one million, two hundred thousand, two hundred twenty-one".