404132021 has 4 divisors (see below), whose sum is σ = 406808544. Its totient is φ = 401455500.

The previous prime is 404131969. The next prime is 404132051. The reversal of 404132021 is 120231404.

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 a de Polignac number, because none of the positive numbers 2^k-404132021 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 (404132051) 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, 1338035 + ... + 1338336.

It is an arithmetic number, because the mean of its divisors is an integer number (101702136).

Almost surely, 2^404132021 is an apocalyptic number.

It is an amenable number.

404132021 is a deficient number, since it is larger than the sum of its proper divisors (2676523).

404132021 is a wasteful number, since it uses less digits than its factorization.

404132021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2676522.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 404132021 is about 20103.0351191058. The cubic root of 404132021 is about 739.3346960417.

Adding to 404132021 its reverse (120231404), we get a palindrome (524363425).

The spelling of 404132021 in words is "four hundred four million, one hundred thirty-two thousand, twenty-one".