212404693921 has 8 divisors (see below), whose sum is σ = 243255006720. Its totient is φ = 181681077408.

The previous prime is 212404693913. The next prime is 212404694009. The reversal of 212404693921 is 129396404212.

212404693921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212404693921 - 2³ = 212404693913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212404693321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31670476 + ... + 31677181.

It is an arithmetic number, because the mean of its divisors is an integer number (30406875840).

Almost surely, 2^212404693921 is an apocalyptic number.

It is an amenable number.

212404693921 is a deficient number, since it is larger than the sum of its proper divisors (30850312799).

212404693921 is an equidigital number, since it uses as much as digits as its factorization.

212404693921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63348143.

The product of its (nonzero) digits is 186624, while the sum is 43.

The spelling of 212404693921 in words is "two hundred twelve billion, four hundred four million, six hundred ninety-three thousand, nine hundred twenty-one".