4345412821 has 2 divisors, whose sum is σ = 4345412822. Its totient is φ = 4345412820.

The previous prime is 4345412779. The next prime is 4345412831. The reversal of 4345412821 is 1282145434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4338198225 + 7214596 = 65865^2 + 2686^2 .

It is a cyclic number.

It is not a de Polignac number, because 4345412821 - 2²³ = 4337024213 is a prime.

It is a super-2 number, since 2×4345412821² = 37765225169822356082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4345412831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2172706410 + 2172706411.

It is an arithmetic number, because the mean of its divisors is an integer number (2172706411).

Almost surely, 2^4345412821 is an apocalyptic number.

It is an amenable number.

4345412821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4345412821 is an equidigital number, since it uses as much as digits as its factorization.

4345412821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30720, while the sum is 34.

The square root of 4345412821 is about 65919.7453044230. The cubic root of 4345412821 is about 1631.8378934215.

The spelling of 4345412821 in words is "four billion, three hundred forty-five million, four hundred twelve thousand, eight hundred twenty-one".