4345211021 has 2 divisors, whose sum is σ = 4345211022. Its totient is φ = 4345211020.

The previous prime is 4345210997. The next prime is 4345211081. The reversal of 4345211021 is 1201125434.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3615616900 + 729594121 = 60130^2 + 27011^2 .

It is a cyclic number.

It is not a de Polignac number, because 4345211021 - 2⁶ = 4345210957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4345211081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2172605510 + 2172605511.

It is an arithmetic number, because the mean of its divisors is an integer number (2172605511).

Almost surely, 2^4345211021 is an apocalyptic number.

It is an amenable number.

4345211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4345211021 is an equidigital number, since it uses as much as digits as its factorization.

4345211021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 4345211021 is about 65918.2146375340. The cubic root of 4345211021 is about 1631.8126323014.

Adding to 4345211021 its reverse (1201125434), we get a palindrome (5546336455).

The spelling of 4345211021 in words is "four billion, three hundred forty-five million, two hundred eleven thousand, twenty-one".