212012222121221 has 4 divisors (see below), whose sum is σ = 212023253527200. Its totient is φ = 212001190715244.

The previous prime is 212012222121209. The next prime is 212012222121253. The reversal of 212012222121221 is 122121222210212.

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 212012222121221 - 2⁶ = 212012222121157 is a prime.

It is a super-2 number, since 2×212012222121221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212012222121521) 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, 5515674161 + ... + 5515712598.

It is an arithmetic number, because the mean of its divisors is an integer number (53005813381800).

Almost surely, 2^{212012222121221} is an apocalyptic number.

It is an amenable number.

212012222121221 is a deficient number, since it is larger than the sum of its proper divisors (11031405979).

212012222121221 is a wasteful number, since it uses less digits than its factorization.

212012222121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11031405978.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 212012222121221 its reverse (122121222210212), we get a palindrome (334133444331433).

The spelling of 212012222121221 in words is "two hundred twelve trillion, twelve billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred twenty-one".