212221012111 has 4 divisors (see below), whose sum is σ = 212222611224. Its totient is φ = 212219413000.

The previous prime is 212221012093. The next prime is 212221012141. The reversal of 212221012111 is 111210122212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212221012111 - 2¹⁷ = 212220881039 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 (212221012141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 580480 + ... + 872581.

It is an arithmetic number, because the mean of its divisors is an integer number (53055652806).

Almost surely, 2^212221012111 is an apocalyptic number.

212221012111 is a deficient number, since it is larger than the sum of its proper divisors (1599113).

212221012111 is a wasteful number, since it uses less digits than its factorization.

212221012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1599112.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 212221012111 its reverse (111210122212), we get a palindrome (323431134323).

The spelling of 212221012111 in words is "two hundred twelve billion, two hundred twenty-one million, twelve thousand, one hundred eleven".