41666021 has 4 divisors (see below), whose sum is σ = 41717472. Its totient is φ = 41614572.

The previous prime is 41665969. The next prime is 41666029. The reversal of 41666021 is 12066614.

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.

It is a cyclic number.

It is not a de Polignac number, because 41666021 - 2⁶ = 41665957 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 (41666029) 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, 24491 + ... + 26136.

It is an arithmetic number, because the mean of its divisors is an integer number (10429368).

Almost surely, 2^41666021 is an apocalyptic number.

It is an amenable number.

41666021 is a deficient number, since it is larger than the sum of its proper divisors (51451).

41666021 is an equidigital number, since it uses as much as digits as its factorization.

41666021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51450.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 41666021 is about 6454.9222303603. The cubic root of 41666021 is about 346.6788464450.

The spelling of 41666021 in words is "forty-one million, six hundred sixty-six thousand, twenty-one".