4345420421 has 4 divisors (see below), whose sum is σ = 4347479052. Its totient is φ = 4343361792.

The previous prime is 4345420399. The next prime is 4345420433. The reversal of 4345420421 is 1240245434.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1240245434 = 2 ⋅620122717.

It can be written as a sum of positive squares in 2 ways, for example, as 1522092196 + 2823328225 = 39014^2 + 53135^2 .

It is a cyclic number.

It is not a de Polignac number, because 4345420421 - 2⁶ = 4345420357 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 (4345420481) 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, 1026146 + ... + 1030371.

It is an arithmetic number, because the mean of its divisors is an integer number (1086869763).

Almost surely, 2^4345420421 is an apocalyptic number.

It is an amenable number.

4345420421 is a deficient number, since it is larger than the sum of its proper divisors (2058631).

4345420421 is a wasteful number, since it uses less digits than its factorization.

4345420421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2058630.

The product of its (nonzero) digits is 15360, while the sum is 29.

The square root of 4345420421 is about 65919.8029502516. The cubic root of 4345420421 is about 1631.8388447665.

Adding to 4345420421 its reverse (1240245434), we get a palindrome (5585665855).

The spelling of 4345420421 in words is "four billion, three hundred forty-five million, four hundred twenty thousand, four hundred twenty-one".