223121410021 has 4 divisors (see below), whose sum is σ = 227868674112. Its totient is φ = 218374145932.

The previous prime is 223121410003. The next prime is 223121410027. The reversal of 223121410021 is 120014121322.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120014121322 = 2 ⋅60007060661.

It is a cyclic number.

It is not a de Polignac number, because 223121410021 - 2¹³ = 223121401829 is a prime.

It is a super-3 number, since 3×223121410021³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223121410027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2373631975 + ... + 2373632068.

It is an arithmetic number, because the mean of its divisors is an integer number (56967168528).

Almost surely, 2^223121410021 is an apocalyptic number.

It is an amenable number.

223121410021 is a deficient number, since it is larger than the sum of its proper divisors (4747264091).

223121410021 is an equidigital number, since it uses as much as digits as its factorization.

223121410021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4747264090.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 223121410021 its reverse (120014121322), we get a palindrome (343135531343).

The spelling of 223121410021 in words is "two hundred twenty-three billion, one hundred twenty-one million, four hundred ten thousand, twenty-one".