223212212121 has 8 divisors (see below), whose sum is σ = 297642955104. Its totient is φ = 148794805280.

The previous prime is 223212212117. The next prime is 223212212123. The reversal of 223212212121 is 121212212322.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 223212212121 - 2² = 223212212117 is a prime.

It is a super-3 number, since 3×223212212121³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (223212212123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3294915 + ... + 3361976.

It is an arithmetic number, because the mean of its divisors is an integer number (37205369388).

Almost surely, 2^223212212121 is an apocalyptic number.

It is an amenable number.

223212212121 is a deficient number, since it is larger than the sum of its proper divisors (74430742983).

223212212121 is a wasteful number, since it uses less digits than its factorization.

223212212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6668071.

The product of its digits is 384, while the sum is 21.

Adding to 223212212121 its reverse (121212212322), we get a palindrome (344424424443).

The spelling of 223212212121 in words is "two hundred twenty-three billion, two hundred twelve million, two hundred twelve thousand, one hundred twenty-one".