4223123212221 has 8 divisors (see below), whose sum is σ = 6256478832960. Its totient is φ = 2815415474796.

The previous prime is 4223123212213. The next prime is 4223123212241. The reversal of 4223123212221 is 1222123213224.

4223123212221 is a `hidden beast` number, since 4 + 2 + 2 + 312 + 321 + 2 + 2 + 21 = 666.

It is not a de Polignac number, because 4223123212221 - 2³ = 4223123212213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 156411970823 = 4223123212221 / (4 + 2 + 2 + 3 + 1 + 2 + 3 + 2 + 1 + 2 + 2 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4223123212241) 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, 78205985385 + ... + 78205985438.

It is an arithmetic number, because the mean of its divisors is an integer number (782059854120).

Almost surely, 2^{4223123212221} is an apocalyptic number.

It is an amenable number.

4223123212221 is a deficient number, since it is larger than the sum of its proper divisors (2033355620739).

4223123212221 is a wasteful number, since it uses less digits than its factorization.

4223123212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156411970832 (or 156411970826 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 4223123212221 its reverse (1222123213224), we get a palindrome (5445246425445).

It can be divided in two parts, 4223123 and 212221, that added together give a palindrome (4435344).

The spelling of 4223123212221 in words is "four trillion, two hundred twenty-three billion, one hundred twenty-three million, two hundred twelve thousand, two hundred twenty-one".