22012221221 has 8 divisors (see below), whose sum is σ = 23488168320. Its totient is φ = 20568015072.

The previous prime is 22012221211. The next prime is 22012221227. The reversal of 22012221221 is 12212221022.

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-22012221221 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 22012221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22012221227) 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, 7933805 + ... + 7936578.

It is an arithmetic number, because the mean of its divisors is an integer number (2936021040).

Almost surely, 2^22012221221 is an apocalyptic number.

It is an amenable number.

22012221221 is a deficient number, since it is larger than the sum of its proper divisors (1475947099).

22012221221 is a wasteful number, since it uses less digits than its factorization.

22012221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15870475.

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

Adding to 22012221221 its reverse (12212221022), we get a palindrome (34224442243).

The spelling of 22012221221 in words is "twenty-two billion, twelve million, two hundred twenty-one thousand, two hundred twenty-one".