212122112112221 has 16 divisors (see below), whose sum is σ = 212809698351360. Its totient is φ = 211435197251520.

The previous prime is 212122112112217. The next prime is 212122112112241. The reversal of 212122112112221 is 122211211221212.

It is a cyclic number.

It is not a de Polignac number, because 212122112112221 - 2² = 212122112112217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212122112112241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5265777146 + ... + 5265817428.

It is an arithmetic number, because the mean of its divisors is an integer number (13300606146960).

Almost surely, 2^{212122112112221} is an apocalyptic number.

It is an amenable number.

212122112112221 is a deficient number, since it is larger than the sum of its proper divisors (687586239139).

212122112112221 is a wasteful number, since it uses less digits than its factorization.

212122112112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48196.

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

Adding to 212122112112221 its reverse (122211211221212), we get a palindrome (334333323333433).

The spelling of 212122112112221 in words is "two hundred twelve trillion, one hundred twenty-two billion, one hundred twelve million, one hundred twelve thousand, two hundred twenty-one".