21022211122121 has 12 divisors (see below), whose sum is σ = 23644431965616. Its totient is φ = 18666656805720.

The previous prime is 21022211122109. The next prime is 21022211122139. The reversal of 21022211122121 is 12122111222012.

It is not a de Polignac number, because 21022211122121 - 2³⁸ = 20747333215177 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21022211122093 and 21022211122102.

It is not an unprimeable number, because it can be changed into a prime (21022211122621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2020195751 + ... + 2020206156.

It is an arithmetic number, because the mean of its divisors is an integer number (1970369330468).

Almost surely, 2^{21022211122121} is an apocalyptic number.

It is an amenable number.

21022211122121 is a deficient number, since it is larger than the sum of its proper divisors (2622220843495).

21022211122121 is a wasteful number, since it uses less digits than its factorization.

21022211122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040401972 (or 4040401961 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21022211122121 its reverse (12122111222012), we get a palindrome (33144322344133).

The spelling of 21022211122121 in words is "twenty-one trillion, twenty-two billion, two hundred eleven million, one hundred twenty-two thousand, one hundred twenty-one".