212454044221 has 4 divisors (see below), whose sum is σ = 215143336000. Its totient is φ = 209764752444.

The previous prime is 212454044213. The next prime is 212454044227. The reversal of 212454044221 is 122440454212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212454044221 - 2³ = 212454044213 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 (212454044227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1344645771 + ... + 1344645928.

It is an arithmetic number, because the mean of its divisors is an integer number (53785834000).

Almost surely, 2^212454044221 is an apocalyptic number.

It is an amenable number.

212454044221 is a deficient number, since it is larger than the sum of its proper divisors (2689291779).

212454044221 is an equidigital number, since it uses as much as digits as its factorization.

212454044221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2689291778.

The product of its (nonzero) digits is 20480, while the sum is 31.

Adding to 212454044221 its reverse (122440454212), we get a palindrome (334894498433).

The spelling of 212454044221 in words is "two hundred twelve billion, four hundred fifty-four million, forty-four thousand, two hundred twenty-one".