223121122021 has 4 divisors (see below), whose sum is σ = 254995568032. Its totient is φ = 191246676012.

The previous prime is 223121122013. The next prime is 223121122043. The reversal of 223121122021 is 120221121322.

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 not a de Polignac number, because 223121122021 - 2³ = 223121122013 is a prime.

It is a super-3 number, since 3×223121122021³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 223121122021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223121122061) 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, 15937222995 + ... + 15937223008.

It is an arithmetic number, because the mean of its divisors is an integer number (63748892008).

Almost surely, 2^223121122021 is an apocalyptic number.

It is an amenable number.

223121122021 is a deficient number, since it is larger than the sum of its proper divisors (31874446011).

223121122021 is an equidigital number, since it uses as much as digits as its factorization.

223121122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31874446010.

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

Adding to 223121122021 its reverse (120221121322), we get a palindrome (343342243343).

The spelling of 223121122021 in words is "two hundred twenty-three billion, one hundred twenty-one million, one hundred twenty-two thousand, twenty-one".