212011022111221 has 16 divisors (see below), whose sum is σ = 223266083256000. Its totient is φ = 200765625667200.

The previous prime is 212011022111173. The next prime is 212011022111227. The reversal of 212011022111221 is 122111220110212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 212011022111221 - 2¹⁹ = 212011021586933 is a prime.

It is a super-2 number, since 2×212011022111221² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212011022111227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1594612855 + ... + 1594745803.

It is an arithmetic number, because the mean of its divisors is an integer number (13954130203500).

Almost surely, 2^{212011022111221} is an apocalyptic number.

It is an amenable number.

212011022111221 is a deficient number, since it is larger than the sum of its proper divisors (11255061144779).

212011022111221 is a wasteful number, since it uses less digits than its factorization.

212011022111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168660.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 212011022111221 its reverse (122111220110212), we get a palindrome (334122242221433).

The spelling of 212011022111221 in words is "two hundred twelve trillion, eleven billion, twenty-two million, one hundred eleven thousand, two hundred twenty-one".