22022021221221 has 16 divisors (see below), whose sum is σ = 35531328357504. Its totient is φ = 11843776118784.

The previous prime is 22022021221091. The next prime is 22022021221229. The reversal of 22022021221221 is 12212212022022.

It is not a de Polignac number, because 22022021221221 - 2¹¹ = 22022021219173 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22022021221229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30843166620 + ... + 30843167333.

It is an arithmetic number, because the mean of its divisors is an integer number (2220708022344).

Almost surely, 2^{22022021221221} is an apocalyptic number.

22022021221221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22022021221221 is a deficient number, since it is larger than the sum of its proper divisors (13509307136283).

22022021221221 is a wasteful number, since it uses less digits than its factorization.

22022021221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61686333980.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 22022021221221 its reverse (12212212022022), we get a palindrome (34234233243243).

The spelling of 22022021221221 in words is "twenty-two trillion, twenty-two billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".