21222102020121 has 32 divisors (see below), whose sum is σ = 31528689984000. Its totient is φ = 14108232568320.

The previous prime is 21222102020101. The next prime is 21222102020219. The reversal of 21222102020121 is 12102020122212.

It is a happy number.

21222102020121 is a `hidden beast` number, since 212 + 2 + 210 + 20 + 201 + 21 = 666.

It is not a de Polignac number, because 21222102020121 - 2⁵ = 21222102020089 is a prime.

It is a super-2 number, since 2×21222102020121² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21222102020094 and 21222102020103.

It is not an unprimeable number, because it can be changed into a prime (21222102020101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115655355 + ... + 115838703.

It is an arithmetic number, because the mean of its divisors is an integer number (985271562000).

Almost surely, 2^{21222102020121} is an apocalyptic number.

It is an amenable number.

21222102020121 is a deficient number, since it is larger than the sum of its proper divisors (10306587963879).

21222102020121 is a wasteful number, since it uses less digits than its factorization.

21222102020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195406 (or 195400 counting only the distinct ones).

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

Adding to 21222102020121 its reverse (12102020122212), we get a palindrome (33324122142333).

The spelling of 21222102020121 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred two million, twenty thousand, one hundred twenty-one".