4221120321 has 24 divisors (see below), whose sum is σ = 6831237504. Its totient is φ = 2489110560.

The previous prime is 4221120283. The next prime is 4221120359. The reversal of 4221120321 is 1230211224.

It is a happy number.

4221120321 is a `hidden beast` number, since 4 + 221 + 120 + 321 = 666.

It is an interprime number because it is at equal distance from previous prime (4221120283) and next prime (4221120359).

It is not a de Polignac number, because 4221120321 - 2⁶ = 4221120257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4221120294 and 4221120303.

It is not an unprimeable number, because it can be changed into a prime (4221820321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 572521 + ... + 579846.

It is an arithmetic number, because the mean of its divisors is an integer number (284634896).

Almost surely, 2^4221120321 is an apocalyptic number.

It is an amenable number.

4221120321 is a deficient number, since it is larger than the sum of its proper divisors (2610117183).

4221120321 is a wasteful number, since it uses less digits than its factorization.

4221120321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152421 (or 1152418 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 4221120321 is about 64970.1494611179. The cubic root of 4221120321 is about 1616.1285802309.

Adding to 4221120321 its reverse (1230211224), we get a palindrome (5451331545).

It can be divided in two parts, 42211203 and 21, that added together give a palindrome (42211224).

The spelling of 4221120321 in words is "four billion, two hundred twenty-one million, one hundred twenty thousand, three hundred twenty-one".