411240021 has 4 divisors (see below), whose sum is σ = 548320032. Its totient is φ = 274160012.

The previous prime is 411240007. The next prime is 411240029. The reversal of 411240021 is 120042114.

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 411240021 - 2⁹ = 411239509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (411240029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68540001 + ... + 68540006.

It is an arithmetic number, because the mean of its divisors is an integer number (137080008).

Almost surely, 2^411240021 is an apocalyptic number.

It is an amenable number.

411240021 is a deficient number, since it is larger than the sum of its proper divisors (137080011).

411240021 is a wasteful number, since it uses less digits than its factorization.

411240021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137080010.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 411240021 is about 20279.0537501137. The cubic root of 411240021 is about 743.6440787323.

Adding to 411240021 its reverse (120042114), we get a palindrome (531282135).

The spelling of 411240021 in words is "four hundred eleven million, two hundred forty thousand, twenty-one".