111212211011221 has 8 divisors (see below), whose sum is σ = 116648807048640. Its totient is φ = 105825721850112.

The previous prime is 111212211011197. The next prime is 111212211011309. The reversal of 111212211011221 is 122110112212111.

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 111212211011221 - 2¹⁹ = 111212210486933 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 (111212211018221) 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, 12526714531 + ... + 12526723408.

It is an arithmetic number, because the mean of its divisors is an integer number (14581100881080).

Almost surely, 2^{111212211011221} is an apocalyptic number.

It is an amenable number.

111212211011221 is a deficient number, since it is larger than the sum of its proper divisors (5436596037419).

111212211011221 is a wasteful number, since it uses less digits than its factorization.

111212211011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25053438155.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 111212211011221 its reverse (122110112212111), we get a palindrome (233322323223332).

The spelling of 111212211011221 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred eleven million, eleven thousand, two hundred twenty-one".