40005204021 has 8 divisors (see below), whose sum is σ = 59266968960. Its totient is φ = 26670135996.

The previous prime is 40005204011. The next prime is 40005204059. The reversal of 40005204021 is 12040250004.

It is not a de Polignac number, because 40005204021 - 2⁹ = 40005203509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40005203985 and 40005204003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40005204011) 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 7 ways as a sum of consecutive naturals, for example, 740837085 + ... + 740837138.

It is an arithmetic number, because the mean of its divisors is an integer number (7408371120).

Almost surely, 2^40005204021 is an apocalyptic number.

It is an amenable number.

40005204021 is a deficient number, since it is larger than the sum of its proper divisors (19261764939).

40005204021 is a wasteful number, since it uses less digits than its factorization.

40005204021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481674232 (or 1481674226 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

Adding to 40005204021 its reverse (12040250004), we get a palindrome (52045454025).

The spelling of 40005204021 in words is "forty billion, five million, two hundred four thousand, twenty-one".