21112102022121 has 120 divisors (see below), whose sum is σ = 34841733806880. Its totient is φ = 12730261864320.

The previous prime is 21112102022119. The next prime is 21112102022159. The reversal of 21112102022121 is 12122020121112.

21112102022121 is a `hidden beast` number, since 211 + 1 + 210 + 2 + 0 + 221 + 21 = 666.

It is not a de Polignac number, because 21112102022121 - 2¹ = 21112102022119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21112102022094 and 21112102022103.

It is not an unprimeable number, because it can be changed into a prime (21112102092121) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 5203868325 + ... + 5203872381.

It is an arithmetic number, because the mean of its divisors is an integer number (290347781724).

Almost surely, 2^{21112102022121} is an apocalyptic number.

It is an amenable number.

21112102022121 is a deficient number, since it is larger than the sum of its proper divisors (13729631784759).

21112102022121 is a wasteful number, since it uses less digits than its factorization.

21112102022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6657 (or 6637 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21112102022121 its reverse (12122020121112), we get a palindrome (33234122143233).

The spelling of 21112102022121 in words is "twenty-one trillion, one hundred twelve billion, one hundred two million, twenty-two thousand, one hundred twenty-one".