22111220212121 has 12 divisors (see below), whose sum is σ = 23138034823092. Its totient is φ = 21128214556416.

The previous prime is 22111220212111. The next prime is 22111220212127. The reversal of 22111220212121 is 12121202211122.

It can be written as a sum of positive squares in 2 ways, for example, as 8964874339600 + 13146345872521 = 2994140^2 + 3625789^2 .

It is not a de Polignac number, because 22111220212121 - 2⁶ = 22111220212057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22111220212093 and 22111220212102.

It is not an unprimeable number, because it can be changed into a prime (22111220212127) 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, 20874236 + ... + 21907901.

It is an arithmetic number, because the mean of its divisors is an integer number (1928169568591).

Almost surely, 2^{22111220212121} is an apocalyptic number.

It is an amenable number.

22111220212121 is a deficient number, since it is larger than the sum of its proper divisors (1026814610971).

22111220212121 is an equidigital number, since it uses as much as digits as its factorization.

22111220212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42783160 (or 42783137 counting only the distinct ones).

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

Adding to 22111220212121 its reverse (12121202211122), we get a palindrome (34232422423243).

The spelling of 22111220212121 in words is "twenty-two trillion, one hundred eleven billion, two hundred twenty million, two hundred twelve thousand, one hundred twenty-one".