223121002121 has 4 divisors (see below), whose sum is σ = 223624661712. Its totient is φ = 222617342532.

The previous prime is 223121002099. The next prime is 223121002123. The reversal of 223121002121 is 121200121322.

223121002121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-223121002121 is a prime.

It is a super-3 number, since 3×223121002121³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 223121002121.

It is not an unprimeable number, because it can be changed into a prime (223121002123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251829131 + ... + 251830016.

It is an arithmetic number, because the mean of its divisors is an integer number (55906165428).

Almost surely, 2^223121002121 is an apocalyptic number.

It is an amenable number.

223121002121 is a deficient number, since it is larger than the sum of its proper divisors (503659591).

223121002121 is an equidigital number, since it uses as much as digits as its factorization.

223121002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503659590.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 223121002121 its reverse (121200121322), we get a palindrome (344321123443).

The spelling of 223121002121 in words is "two hundred twenty-three billion, one hundred twenty-one million, two thousand, one hundred twenty-one".