22220021221 has 4 divisors (see below), whose sum is σ = 22233730444. Its totient is φ = 22206312000.

The previous prime is 22220021177. The next prime is 22220021261. The reversal of 22220021221 is 12212002222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7394280100 + 14825741121 = 85990^2 + 121761^2 .

It is a cyclic number.

It is not a de Polignac number, because 22220021221 - 2²⁵ = 22186466789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22220021195 and 22220021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22220021261) 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 3 ways as a sum of consecutive naturals, for example, 6852180 + ... + 6855421.

It is an arithmetic number, because the mean of its divisors is an integer number (5558432611).

Almost surely, 2^22220021221 is an apocalyptic number.

It is an amenable number.

22220021221 is a deficient number, since it is larger than the sum of its proper divisors (13709223).

22220021221 is a wasteful number, since it uses less digits than its factorization.

22220021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13709222.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 22220021221 its reverse (12212002222), we get a palindrome (34432023443).

The spelling of 22220021221 in words is "twenty-two billion, two hundred twenty million, twenty-one thousand, two hundred twenty-one".