211112211202221 has 8 divisors (see below), whose sum is σ = 321694798022464. Its totient is φ = 120635549258400.

The previous prime is 211112211202201. The next prime is 211112211202259. The reversal of 211112211202221 is 122202112211112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211112211202221 - 2⁹ = 211112211201709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 10052962438201 = 211112211202221 / (2 + 1 + 1 + 1 + 1 + 2 + 2 + 1 + 1 + 2 + 0 + 2 + 2 + 2 + 1).

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 (211112211202201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5026481219080 + ... + 5026481219121.

It is an arithmetic number, because the mean of its divisors is an integer number (40211849752808).

Almost surely, 2^{211112211202221} is an apocalyptic number.

211112211202221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211112211202221 is a deficient number, since it is larger than the sum of its proper divisors (110582586820243).

211112211202221 is a wasteful number, since it uses less digits than its factorization.

211112211202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10052962438211.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 211112211202221 its reverse (122202112211112), we get a palindrome (333314323413333).

The spelling of 211112211202221 in words is "two hundred eleven trillion, one hundred twelve billion, two hundred eleven million, two hundred two thousand, two hundred twenty-one".