404212122221 has 6 divisors (see below), whose sum is σ = 411179298222. Its totient is φ = 397361065880.

The previous prime is 404212122217. The next prime is 404212122253. The reversal of 404212122221 is 122221212404.

It can be written as a sum of positive squares in only one way, i.e., 266270448196 + 137941674025 = 516014^2 + 371405^2 .

It is not a de Polignac number, because 404212122221 - 2² = 404212122217 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 (404212121221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58056290 + ... + 58063251.

It is an arithmetic number, because the mean of its divisors is an integer number (68529883037).

Almost surely, 2^404212122221 is an apocalyptic number.

It is an amenable number.

404212122221 is a deficient number, since it is larger than the sum of its proper divisors (6967176001).

404212122221 is an equidigital number, since it uses as much as digits as its factorization.

404212122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116119659 (or 116119600 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 404212122221 its reverse (122221212404), we get a palindrome (526433334625).

The spelling of 404212122221 in words is "four hundred four billion, two hundred twelve million, one hundred twenty-two thousand, two hundred twenty-one".