212111222021 has 8 divisors (see below), whose sum is σ = 212378910720. Its totient is φ = 211843599408.

The previous prime is 212111221997. The next prime is 212111222023. The reversal of 212111222021 is 120222111212.

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 212111222021 - 2¹⁴ = 212111205637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111222023) 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, 10347260 + ... + 10367738.

It is an arithmetic number, because the mean of its divisors is an integer number (26547363840).

Almost surely, 2^212111222021 is an apocalyptic number.

It is an amenable number.

212111222021 is a deficient number, since it is larger than the sum of its proper divisors (267688699).

212111222021 is a wasteful number, since it uses less digits than its factorization.

212111222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33043.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212111222021 its reverse (120222111212), we get a palindrome (332333333233).

The spelling of 212111222021 in words is "two hundred twelve billion, one hundred eleven million, two hundred twenty-two thousand, twenty-one".