212221022221 has 8 divisors (see below), whose sum is σ = 228551763104. Its totient is φ = 195891145200.

The previous prime is 212221022219. The next prime is 212221022249. The reversal of 212221022221 is 122220122212.

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

It is a cyclic number.

It is not a de Polignac number, because 212221022221 - 2¹ = 212221022219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212221022281) 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, 349030 + ... + 739096.

It is an arithmetic number, because the mean of its divisors is an integer number (28568970388).

Almost surely, 2^212221022221 is an apocalyptic number.

It is an amenable number.

212221022221 is a deficient number, since it is larger than the sum of its proper divisors (16330740883).

212221022221 is a wasteful number, since it uses less digits than its factorization.

212221022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431931.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 212221022221 its reverse (122220122212), we get a palindrome (334441144433).

Subtracting from 212221022221 its reverse (122220122212), we obtain a palindrome (90000900009).

The spelling of 212221022221 in words is "two hundred twelve billion, two hundred twenty-one million, twenty-two thousand, two hundred twenty-one".