4340221421 has 4 divisors (see below), whose sum is σ = 4340353692. Its totient is φ = 4340089152.

The previous prime is 4340221411. The next prime is 4340221427. The reversal of 4340221421 is 1241220434.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1241220434 = 2 ⋅620610217.

It can be written as a sum of positive squares in 2 ways, for example, as 168870025 + 4171351396 = 12995^2 + 64586^2 .

It is a cyclic number.

It is not a de Polignac number, because 4340221421 - 2²² = 4336027117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4340221427) 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, 24371 + ... + 96303.

It is an arithmetic number, because the mean of its divisors is an integer number (1085088423).

Almost surely, 2^4340221421 is an apocalyptic number.

It is an amenable number.

4340221421 is a deficient number, since it is larger than the sum of its proper divisors (132271).

4340221421 is an equidigital number, since it uses as much as digits as its factorization.

4340221421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132270.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 4340221421 is about 65880.3568675823. The cubic root of 4340221421 is about 1631.1877903180.

Adding to 4340221421 its reverse (1241220434), we get a palindrome (5581441855).

The spelling of 4340221421 in words is "four billion, three hundred forty million, two hundred twenty-one thousand, four hundred twenty-one".