4255543021 has 4 divisors (see below), whose sum is σ = 4255961500. Its totient is φ = 4255124544.

The previous prime is 4255543013. The next prime is 4255543057. The reversal of 4255543021 is 1203455524.

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 3980348100 + 275194921 = 63090^2 + 16589^2 .

It is a cyclic number.

It is not a de Polignac number, because 4255543021 - 2³ = 4255543013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4255543001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193596 + ... + 214453.

It is an arithmetic number, because the mean of its divisors is an integer number (1063990375).

Almost surely, 2^4255543021 is an apocalyptic number.

It is an amenable number.

4255543021 is a deficient number, since it is larger than the sum of its proper divisors (418479).

4255543021 is a wasteful number, since it uses less digits than its factorization.

4255543021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418478.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 4255543021 is about 65234.5232296520. The cubic root of 4255543021 is about 1620.5098000524.

Adding to 4255543021 its reverse (1203455524), we get a palindrome (5458998545).

The spelling of 4255543021 in words is "four billion, two hundred fifty-five million, five hundred forty-three thousand, twenty-one".