12211404021 has 8 divisors (see below), whose sum is σ = 18090968960. Its totient is φ = 8140935996.

The previous prime is 12211404017. The next prime is 12211404031. The reversal of 12211404021 is 12040411221.

12211404021 is a `hidden beast` number, since 1 + 221 + 1 + 40 + 402 + 1 = 666.

It is not a de Polignac number, because 12211404021 - 2² = 12211404017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12211403985 and 12211404003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211404031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226137085 + ... + 226137138.

It is an arithmetic number, because the mean of its divisors is an integer number (2261371120).

Almost surely, 2^12211404021 is an apocalyptic number.

It is an amenable number.

12211404021 is a deficient number, since it is larger than the sum of its proper divisors (5879564939).

12211404021 is an equidigital number, since it uses as much as digits as its factorization.

12211404021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452274232 (or 452274226 counting only the distinct ones).

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

Adding to 12211404021 its reverse (12040411221), we get a palindrome (24251815242).

The spelling of 12211404021 in words is "twelve billion, two hundred eleven million, four hundred four thousand, twenty-one".