21200022222121 has 8 divisors (see below), whose sum is σ = 22475604708000. Its totient is φ = 19927608886848.

The previous prime is 21200022222017. The next prime is 21200022222133. The reversal of 21200022222121 is 12122222000212.

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 21200022222121 - 2¹¹ = 21200022220073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21200022222521) 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 7 ways as a sum of consecutive naturals, for example, 792273871 + ... + 792300628.

It is an arithmetic number, because the mean of its divisors is an integer number (2809450588500).

Almost surely, 2^{21200022222121} is an apocalyptic number.

It is an amenable number.

21200022222121 is a deficient number, since it is larger than the sum of its proper divisors (1275582485879).

21200022222121 is a wasteful number, since it uses less digits than its factorization.

21200022222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584575303.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21200022222121 its reverse (12122222000212), we get a palindrome (33322244222333).

The spelling of 21200022222121 in words is "twenty-one trillion, two hundred billion, twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".