41209921 has 4 divisors (see below), whose sum is σ = 43634052. Its totient is φ = 38785792.

The previous prime is 41209901. The next prime is 41209963. The reversal of 41209921 is 12990214.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35569296 + 5640625 = 5964^2 + 2375^2 .

It is a cyclic number.

It is not a de Polignac number, because 41209921 - 2⁹ = 41209409 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 41209921.

It is not an unprimeable number, because it can be changed into a prime (41209901) 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, 1212040 + ... + 1212073.

It is an arithmetic number, because the mean of its divisors is an integer number (10908513).

Almost surely, 2^41209921 is an apocalyptic number.

It is an amenable number.

41209921 is a deficient number, since it is larger than the sum of its proper divisors (2424131).

41209921 is a wasteful number, since it uses less digits than its factorization.

41209921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424130.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 41209921 is about 6419.4953851529. The cubic root of 41209921 is about 345.4092210556.

It can be divided in two parts, 4120 and 9921, that added together give a palindrome (14041).

The spelling of 41209921 in words is "forty-one million, two hundred nine thousand, nine hundred twenty-one".