4225252221 has 16 divisors (see below), whose sum is σ = 6263736000. Its totient is φ = 2814988464.

The previous prime is 4225252189. The next prime is 4225252223. The reversal of 4225252221 is 1222525224.

It is a happy number.

It is not a de Polignac number, because 4225252221 - 2⁵ = 4225252189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4225252223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8691 + ... + 92336.

It is an arithmetic number, because the mean of its divisors is an integer number (391483500).

Almost surely, 2^4225252221 is an apocalyptic number.

It is an amenable number.

4225252221 is a deficient number, since it is larger than the sum of its proper divisors (2038483779).

4225252221 is a wasteful number, since it uses less digits than its factorization.

4225252221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102585 (or 102579 counting only the distinct ones).

The product of its digits is 6400, while the sum is 27.

The square root of 4225252221 is about 65001.9401325837. The cubic root of 4225252221 is about 1616.6557312802.

Adding to 4225252221 its reverse (1222525224), we get a palindrome (5447777445).

The spelling of 4225252221 in words is "four billion, two hundred twenty-five million, two hundred fifty-two thousand, two hundred twenty-one".