40434040021 has 4 divisors (see below), whose sum is σ = 40472078752. Its totient is φ = 40396001292.

The previous prime is 40434039953. The next prime is 40434040027. The reversal of 40434040021 is 12004043404.

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 40434040021 - 2¹⁵ = 40434007253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40434039974 and 40434040001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40434040027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19017771 + ... + 19019896.

It is an arithmetic number, because the mean of its divisors is an integer number (10118019688).

Almost surely, 2^40434040021 is an apocalyptic number.

It is an amenable number.

40434040021 is a deficient number, since it is larger than the sum of its proper divisors (38038731).

40434040021 is a wasteful number, since it uses less digits than its factorization.

40434040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38038730.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 40434040021 its reverse (12004043404), we get a palindrome (52438083425).

The spelling of 40434040021 in words is "forty billion, four hundred thirty-four million, forty thousand, twenty-one".