212122112121221 has 8 divisors (see below), whose sum is σ = 212613827510784. Its totient is φ = 211630405147200.

The previous prime is 212122112121209. The next prime is 212122112121277. The reversal of 212122112121221 is 122121211221212.

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 212122112121221 - 2¹⁰ = 212122112120197 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 (212122112121721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49851740 + ... + 53939226.

It is an arithmetic number, because the mean of its divisors is an integer number (26576728438848).

Almost surely, 2^{212122112121221} is an apocalyptic number.

It is an amenable number.

212122112121221 is a deficient number, since it is larger than the sum of its proper divisors (491715389563).

212122112121221 is a wasteful number, since it uses less digits than its factorization.

212122112121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4207771.

The product of its digits is 256, while the sum is 23.

Adding to 212122112121221 its reverse (122121211221212), we get a palindrome (334243323342433).

Subtracting from 212122112121221 its reverse (122121211221212), we obtain a palindrome (90000900900009).

The spelling of 212122112121221 in words is "two hundred twelve trillion, one hundred twenty-two billion, one hundred twelve million, one hundred twenty-one thousand, two hundred twenty-one".