22113212121 has 144 divisors (see below), whose sum is σ = 44134751232. Its totient is φ = 10354780800.

The previous prime is 22113212119. The next prime is 22113212129. The reversal of 22113212121 is 12121231122.

22113212121 is a `hidden beast` number, since 221 + 1 + 321 + 2 + 121 = 666.

It is not a de Polignac number, because 22113212121 - 2¹ = 22113212119 is a prime.

22113212121 is a modest number, since divided by 212121 gives 22113 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 22113212094 and 22113212103.

It is not an unprimeable number, because it can be changed into a prime (22113212129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 5033836 + ... + 5038226.

It is an arithmetic number, because the mean of its divisors is an integer number (306491328).

Almost surely, 2^22113212121 is an apocalyptic number.

22113212121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22113212121 is a deficient number, since it is larger than the sum of its proper divisors (22021539111).

22113212121 is a wasteful number, since it uses less digits than its factorization.

22113212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4484 (or 4468 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 22113212121 its reverse (12121231122), we get a palindrome (34234443243).

The spelling of 22113212121 in words is "twenty-two billion, one hundred thirteen million, two hundred twelve thousand, one hundred twenty-one".