21222000122121 has 8 divisors (see below), whose sum is σ = 31440000180960. Its totient is φ = 14148000081396.

The previous prime is 21222000122117. The next prime is 21222000122159. The reversal of 21222000122121 is 12122100022212.

It is a happy number.

It is not a de Polignac number, because 21222000122121 - 2² = 21222000122117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21222000122094 and 21222000122103.

It is not an unprimeable number, because it can be changed into a prime (21222000127121) 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, 393000002235 + ... + 393000002288.

It is an arithmetic number, because the mean of its divisors is an integer number (3930000022620).

Almost surely, 2^{21222000122121} is an apocalyptic number.

It is an amenable number.

21222000122121 is a deficient number, since it is larger than the sum of its proper divisors (10218000058839).

21222000122121 is an equidigital number, since it uses as much as digits as its factorization.

21222000122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786000004532 (or 786000004526 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21222000122121 its reverse (12122100022212), we get a palindrome (33344100144333).

Subtracting from 21222000122121 its reverse (12122100022212), we obtain a palindrome (9099900099909).

The spelling of 21222000122121 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-two thousand, one hundred twenty-one".