223121012121 has 24 divisors (see below), whose sum is σ = 376892493120. Its totient is φ = 124532656416.

The previous prime is 223121012099. The next prime is 223121012137. The reversal of 223121012121 is 121210121322.

It is not a de Polignac number, because 223121012121 - 2⁶ = 223121012057 is a prime.

It is a super-3 number, since 3×223121012121³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 223121012094 and 223121012103.

It is not an unprimeable number, because it can be changed into a prime (223121012141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41178726 + ... + 41184143.

It is an arithmetic number, because the mean of its divisors is an integer number (15703853880).

Almost surely, 2^223121012121 is an apocalyptic number.

223121012121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

223121012121 is a deficient number, since it is larger than the sum of its proper divisors (153771480999).

223121012121 is a wasteful number, since it uses less digits than its factorization.

223121012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82362925 (or 82362922 counting only the distinct ones).

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

Adding to 223121012121 its reverse (121210121322), we get a palindrome (344331133443).

The spelling of 223121012121 in words is "two hundred twenty-three billion, one hundred twenty-one million, twelve thousand, one hundred twenty-one".