4140434021 has 4 divisors (see below), whose sum is σ = 4141100544. Its totient is φ = 4139767500.

The previous prime is 4140433993. The next prime is 4140434057. The reversal of 4140434021 is 1204340414.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1204340414 = 2 ⋅602170207.

It is a cyclic number.

It is not a de Polignac number, because 4140434021 - 2¹⁴ = 4140417637 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 (4140434521) 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, 323855 + ... + 336396.

It is an arithmetic number, because the mean of its divisors is an integer number (1035275136).

Almost surely, 2^4140434021 is an apocalyptic number.

It is an amenable number.

4140434021 is a deficient number, since it is larger than the sum of its proper divisors (666523).

4140434021 is an equidigital number, since it uses as much as digits as its factorization.

4140434021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666522.

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

The square root of 4140434021 is about 64346.2044024354. The cubic root of 4140434021 is about 1605.7648836937.

Adding to 4140434021 its reverse (1204340414), we get a palindrome (5344774435).

The spelling of 4140434021 in words is "four billion, one hundred forty million, four hundred thirty-four thousand, twenty-one".