21202121102222 has 4 divisors (see below), whose sum is σ = 31803181653336. Its totient is φ = 10601060551110.

The previous prime is 21202121102221. The next prime is 21202121102231. The reversal of 21202121102222 is 22220112120212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21202121102194 and 21202121102203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202121102221) 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 as a sum of consecutive naturals, namely, 5300530275554 + ... + 5300530275557.

It is an arithmetic number, because the mean of its divisors is an integer number (7950795413334).

Almost surely, 2^{21202121102222} is an apocalyptic number.

21202121102222 is a deficient number, since it is larger than the sum of its proper divisors (10601060551114).

21202121102222 is a wasteful number, since it uses less digits than its factorization.

21202121102222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10601060551113.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21202121102222 its reverse (22220112120212), we get a palindrome (43422233222434).

The spelling of 21202121102222 in words is "twenty-one trillion, two hundred two billion, one hundred twenty-one million, one hundred two thousand, two hundred twenty-two".