21222122121208 has 8 divisors (see below), whose sum is σ = 39791478977280. Its totient is φ = 10611061060600.

The previous prime is 21222122121197. The next prime is 21222122121223. The reversal of 21222122121208 is 80212122122212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1326382632568 + ... + 1326382632583.

It is an arithmetic number, because the mean of its divisors is an integer number (4973934872160).

Almost surely, 2^{21222122121208} is an apocalyptic number.

It is an amenable number.

21222122121208 is a deficient number, since it is larger than the sum of its proper divisors (18569356856072).

21222122121208 is a wasteful number, since it uses less digits than its factorization.

21222122121208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2652765265157 (or 2652765265153 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The spelling of 21222122121208 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-two million, one hundred twenty-one thousand, two hundred eight".