4231120221 has 12 divisors (see below), whose sum is σ = 6226932348. Its totient is φ = 2767524864.

The previous prime is 4231120217. The next prime is 4231120249. The reversal of 4231120221 is 1220211324.

It is a happy number.

4231120221 is a `hidden beast` number, since 423 + 1 + 1 + 20 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3842636121 + 388484100 = 61989^2 + 19710^2 .

It is not a de Polignac number, because 4231120221 - 2² = 4231120217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4231120194 and 4231120203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4231120721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4434660 + ... + 4435613.

It is an arithmetic number, because the mean of its divisors is an integer number (518911029).

Almost surely, 2^4231120221 is an apocalyptic number.

It is an amenable number.

4231120221 is a deficient number, since it is larger than the sum of its proper divisors (1995812127).

4231120221 is a wasteful number, since it uses less digits than its factorization.

4231120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8870332 (or 8870329 counting only the distinct ones).

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

The square root of 4231120221 is about 65047.0615862085. The cubic root of 4231120221 is about 1617.4037850538.

Adding to 4231120221 its reverse (1220211324), we get a palindrome (5451331545).

The spelling of 4231120221 in words is "four billion, two hundred thirty-one million, one hundred twenty thousand, two hundred twenty-one".