404242021031 has 4 divisors (see below), whose sum is σ = 404356963992. Its totient is φ = 404127078072.

The previous prime is 404242021009. The next prime is 404242021039. The reversal of 404242021031 is 130120242404.

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

It is a cyclic number.

It is not a de Polignac number, because 404242021031 - 2³⁰ = 403168279207 is a prime.

It is a super-2 number, since 2×404242021031² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404242020988 and 404242021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404242021039) 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, 57466205 + ... + 57473238.

It is an arithmetic number, because the mean of its divisors is an integer number (101089240998).

Almost surely, 2^404242021031 is an apocalyptic number.

404242021031 is a deficient number, since it is larger than the sum of its proper divisors (114942961).

404242021031 is a wasteful number, since it uses less digits than its factorization.

404242021031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114942960.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 404242021031 its reverse (130120242404), we get a palindrome (534362263435).

The spelling of 404242021031 in words is "four hundred four billion, two hundred forty-two million, twenty-one thousand, thirty-one".