212212040221 has 4 divisors (see below), whose sum is σ = 212228643744. Its totient is φ = 212195436700.

The previous prime is 212212040171. The next prime is 212212040291. The reversal of 212212040221 is 122040212212.

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 212212040221 - 2⁹ = 212212039709 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 (212212040291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8282575 + ... + 8308156.

It is an arithmetic number, because the mean of its divisors is an integer number (53057160936).

Almost surely, 2^212212040221 is an apocalyptic number.

It is an amenable number.

212212040221 is a deficient number, since it is larger than the sum of its proper divisors (16603523).

212212040221 is a wasteful number, since it uses less digits than its factorization.

212212040221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16603522.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 212212040221 its reverse (122040212212), we get a palindrome (334252252433).

The spelling of 212212040221 in words is "two hundred twelve billion, two hundred twelve million, forty thousand, two hundred twenty-one".