404101021 has 4 divisors (see below), whose sum is σ = 408969792. Its totient is φ = 399232252.

The previous prime is 404100997. The next prime is 404101031. The reversal of 404101021 is 120101404.

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 404101021 - 2⁵ = 404100989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404100992 and 404101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404101031) 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, 2434261 + ... + 2434426.

It is an arithmetic number, because the mean of its divisors is an integer number (102242448).

Almost surely, 2^404101021 is an apocalyptic number.

It is an amenable number.

404101021 is a deficient number, since it is larger than the sum of its proper divisors (4868771).

404101021 is an equidigital number, since it uses as much as digits as its factorization.

404101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4868770.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 404101021 is about 20102.2640764666. The cubic root of 404101021 is about 739.3157913600.

Adding to 404101021 its reverse (120101404), we get a palindrome (524202425).

The spelling of 404101021 in words is "four hundred four million, one hundred one thousand, twenty-one".