404020111221 has 32 divisors (see below), whose sum is σ = 604952371200. Its totient is φ = 266469134400.

The previous prime is 404020111151. The next prime is 404020111237. The reversal of 404020111221 is 122111020404.

404020111221 is a `hidden beast` number, since 40 + 402 + 0 + 1 + 1 + 1 + 221 = 666.

It is not a de Polignac number, because 404020111221 - 2⁷ = 404020111093 is a prime.

It is a super-2 number, since 2×404020111221² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 404020111194 and 404020111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404020111321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3429915 + ... + 3545751.

It is an arithmetic number, because the mean of its divisors is an integer number (18904761600).

Almost surely, 2^404020111221 is an apocalyptic number.

It is an amenable number.

404020111221 is a deficient number, since it is larger than the sum of its proper divisors (200932259979).

404020111221 is a wasteful number, since it uses less digits than its factorization.

404020111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117226 (or 117220 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 404020111221 its reverse (122111020404), we get a palindrome (526131131625).

The spelling of 404020111221 in words is "four hundred four billion, twenty million, one hundred eleven thousand, two hundred twenty-one".