22021222121 has 8 divisors (see below), whose sum is σ = 22744073160. Its totient is φ = 21309754752.

The previous prime is 22021222109. The next prime is 22021222159. The reversal of 22021222121 is 12122212022.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5691193600 + 16330028521 = 75440^2 + 127789^2 .

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 22021222121 - 2³⁴ = 4841352937 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 22021222121.

It is not an unprimeable number, because it can be changed into a prime (22021222621) 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, 2841986 + ... + 2849723.

It is an arithmetic number, because the mean of its divisors is an integer number (2843009145).

Almost surely, 2^22021222121 is an apocalyptic number.

It is an amenable number.

22021222121 is a deficient number, since it is larger than the sum of its proper divisors (722851039).

22021222121 is an equidigital number, since it uses as much as digits as its factorization.

22021222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5691835.

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

Adding to 22021222121 its reverse (12122212022), we get a palindrome (34143434143).

The spelling of 22021222121 in words is "twenty-two billion, twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".