22122121110021 has 12 divisors (see below), whose sum is σ = 31963068435948. Its totient is φ = 14743976048064.

The previous prime is 22122121109999. The next prime is 22122121110029. The reversal of 22122121110021 is 12001112122122.

22122121110021 is a `hidden beast` number, since 221 + 221 + 211 + 10 + 0 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9862809341121 + 12259311768900 = 3140511^2 + 3501330^2 .

It is not a de Polignac number, because 22122121110021 - 2²¹ = 22122119012869 is a prime.

It is a super-2 number, since 2×22122121110021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22122121109976 and 22122121110003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22122121110029) 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, 342023530 + ... + 342088203.

It is an arithmetic number, because the mean of its divisors is an integer number (2663589036329).

Almost surely, 2^{22122121110021} is an apocalyptic number.

It is an amenable number.

22122121110021 is a deficient number, since it is larger than the sum of its proper divisors (9840947325927).

22122121110021 is a wasteful number, since it uses less digits than its factorization.

22122121110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684115332 (or 684115329 counting only the distinct ones).

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

Adding to 22122121110021 its reverse (12001112122122), we get a palindrome (34123233232143).

It can be divided in two parts, 2212212 and 1110021, that added together give a palindrome (3322233).

The spelling of 22122121110021 in words is "twenty-two trillion, one hundred twenty-two billion, one hundred twenty-one million, one hundred ten thousand, twenty-one".