404211212021 has 2 divisors, whose sum is σ = 404211212022. Its totient is φ = 404211212020.

The previous prime is 404211211967. The next prime is 404211212033. The reversal of 404211212021 is 120212112404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231808546225 + 172402665796 = 481465^2 + 415214^2 .

It is a cyclic number.

It is not a de Polignac number, because 404211212021 - 2³⁸ = 129333305077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 404211211984 and 404211212002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404211212221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202105606010 + 202105606011.

It is an arithmetic number, because the mean of its divisors is an integer number (202105606011).

Almost surely, 2^404211212021 is an apocalyptic number.

It is an amenable number.

404211212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

404211212021 is an equidigital number, since it uses as much as digits as its factorization.

404211212021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 404211212021 its reverse (120212112404), we get a palindrome (524423324425).

The spelling of 404211212021 in words is "four hundred four billion, two hundred eleven million, two hundred twelve thousand, twenty-one".