4340431021 has 4 divisors (see below), whose sum is σ = 4382571232. Its totient is φ = 4298290812.

The previous prime is 4340431019. The next prime is 4340431049. The reversal of 4340431021 is 1201340434.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4340431021 - 2¹ = 4340431019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4340430983 and 4340431001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4340431321) 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, 21069951 + ... + 21070156.

It is an arithmetic number, because the mean of its divisors is an integer number (1095642808).

Almost surely, 2^4340431021 is an apocalyptic number.

It is an amenable number.

4340431021 is a deficient number, since it is larger than the sum of its proper divisors (42140211).

4340431021 is a wasteful number, since it uses less digits than its factorization.

4340431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42140210.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 4340431021 is about 65881.9476108592. The cubic root of 4340431021 is about 1631.2140479229.

Adding to 4340431021 its reverse (1201340434), we get a palindrome (5541771455).

The spelling of 4340431021 in words is "four billion, three hundred forty million, four hundred thirty-one thousand, twenty-one".