40066021 has 4 divisors (see below), whose sum is σ = 40079200. Its totient is φ = 40052844.

The previous prime is 40066007. The next prime is 40066031. The reversal of 40066021 is 12066004.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40066021 - 2⁵ = 40065989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40066021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40066001) 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, 550 + ... + 8968.

It is an arithmetic number, because the mean of its divisors is an integer number (10019800).

Almost surely, 2^40066021 is an apocalyptic number.

It is an amenable number.

40066021 is a deficient number, since it is larger than the sum of its proper divisors (13179).

40066021 is an equidigital number, since it uses as much as digits as its factorization.

40066021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13178.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 40066021 is about 6329.7725867522. The cubic root of 40066021 is about 342.1832431141.

The spelling of 40066021 in words is "forty million, sixty-six thousand, twenty-one".