22021201221 has 16 divisors (see below), whose sum is σ = 29936491200. Its totient is φ = 14396133888.

The previous prime is 22021201217. The next prime is 22021201283. The reversal of 22021201221 is 12210212022.

It is not a de Polignac number, because 22021201221 - 2² = 22021201217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22021201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021201211) 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, 315411 + ... + 378848.

It is an arithmetic number, because the mean of its divisors is an integer number (1871030700).

Almost surely, 2^22021201221 is an apocalyptic number.

It is an amenable number.

22021201221 is a deficient number, since it is larger than the sum of its proper divisors (7915289979).

22021201221 is a wasteful number, since it uses less digits than its factorization.

22021201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694468.

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

Adding to 22021201221 its reverse (12210212022), we get a palindrome (34231413243).

The spelling of 22021201221 in words is "twenty-two billion, twenty-one million, two hundred one thousand, two hundred twenty-one".