221021022221 has 8 divisors (see below), whose sum is σ = 223215657984. Its totient is φ = 218834812000.

The previous prime is 221021022193. The next prime is 221021022241. The reversal of 221021022221 is 122220120122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221021022221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221021022221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021022241) 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, 2053655 + ... + 2158596.

It is an arithmetic number, because the mean of its divisors is an integer number (27901957248).

Almost surely, 2^221021022221 is an apocalyptic number.

It is an amenable number.

221021022221 is a deficient number, since it is larger than the sum of its proper divisors (2194635763).

221021022221 is a wasteful number, since it uses less digits than its factorization.

221021022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4212771.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221021022221 its reverse (122220120122), we get a palindrome (343241142343).

The spelling of 221021022221 in words is "two hundred twenty-one billion, twenty-one million, twenty-two thousand, two hundred twenty-one".