12021212221111 has 4 divisors (see below), whose sum is σ = 12100822898224. Its totient is φ = 11941601544000.

The previous prime is 12021212221103. The next prime is 12021212221129. The reversal of 12021212221111 is 11112221212021.

It is a happy number.

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 12021212221111 - 2³ = 12021212221103 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 (12021212221141) 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, 39805338330 + ... + 39805338631.

It is an arithmetic number, because the mean of its divisors is an integer number (3025205724556).

Almost surely, 2^{12021212221111} is an apocalyptic number.

12021212221111 is a deficient number, since it is larger than the sum of its proper divisors (79610677113).

12021212221111 is an equidigital number, since it uses as much as digits as its factorization.

12021212221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79610677112.

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

Adding to 12021212221111 its reverse (11112221212021), we get a palindrome (23133433433132).

The spelling of 12021212221111 in words is "twelve trillion, twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, one hundred eleven".