4457726221 has 4 divisors (see below), whose sum is σ = 4800628252. Its totient is φ = 4114824192.

The previous prime is 4457726201. The next prime is 4457726227. The reversal of 4457726221 is 1226277544.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 794450596 + 3663275625 = 28186^2 + 60525^2 .

It is a cyclic number.

It is not a de Polignac number, because 4457726221 - 2⁹ = 4457725709 is a prime.

It is a super-2 number, since 2×4457726221² = 39742646122781881682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4457726227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171450996 + ... + 171451021.

It is an arithmetic number, because the mean of its divisors is an integer number (1200157063).

Almost surely, 2^4457726221 is an apocalyptic number.

It is an amenable number.

4457726221 is a deficient number, since it is larger than the sum of its proper divisors (342902031).

4457726221 is a wasteful number, since it uses less digits than its factorization.

4457726221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342902030.

The product of its digits is 188160, while the sum is 40.

The square root of 4457726221 is about 66766.2056807184. The cubic root of 4457726221 is about 1645.7775380247. Note that the first 3 decimals are identical.

The spelling of 4457726221 in words is "four billion, four hundred fifty-seven million, seven hundred twenty-six thousand, two hundred twenty-one".