4345523221 has 16 divisors (see below), whose sum is σ = 4957470000. Its totient is φ = 3773472768.

The previous prime is 4345523219. The next prime is 4345523233. The reversal of 4345523221 is 1223255434.

It can be written as a sum of positive squares in 8 ways, for example, as 4558225 + 4340964996 = 2135^2 + 65886^2 .

It is not a de Polignac number, because 4345523221 - 2¹ = 4345523219 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 (4345523251) 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, 670605 + ... + 677053.

It is an arithmetic number, because the mean of its divisors is an integer number (309841875).

Almost surely, 2^4345523221 is an apocalyptic number.

It is an amenable number.

4345523221 is a deficient number, since it is larger than the sum of its proper divisors (611946779).

4345523221 is a wasteful number, since it uses less digits than its factorization.

4345523221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9528.

The product of its digits is 28800, while the sum is 31.

The square root of 4345523221 is about 65920.5826809806. The cubic root of 4345523221 is about 1631.8517128509.

Adding to 4345523221 its reverse (1223255434), we get a palindrome (5568778655).

The spelling of 4345523221 in words is "four billion, three hundred forty-five million, five hundred twenty-three thousand, two hundred twenty-one".