22212202121 has 4 divisors (see below), whose sum is σ = 22576336644. Its totient is φ = 21848067600.

The previous prime is 22212202097. The next prime is 22212202157. The reversal of 22212202121 is 12120221222.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12120221222 = 2 ⋅6060110611.

It can be written as a sum of positive squares in 2 ways, for example, as 1036131721 + 21176070400 = 32189^2 + 145520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22212202121 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 22212202121.

It is not an unprimeable number, because it can be changed into a prime (22212202171) 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, 182067170 + ... + 182067291.

It is an arithmetic number, because the mean of its divisors is an integer number (5644084161).

Almost surely, 2^22212202121 is an apocalyptic number.

It is an amenable number.

22212202121 is a deficient number, since it is larger than the sum of its proper divisors (364134523).

22212202121 is an equidigital number, since it uses as much as digits as its factorization.

22212202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364134522.

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

Adding to 22212202121 its reverse (12120221222), we get a palindrome (34332423343).

The spelling of 22212202121 in words is "twenty-two billion, two hundred twelve million, two hundred two thousand, one hundred twenty-one".