211112120201221 has 4 divisors (see below), whose sum is σ = 211112151932812. Its totient is φ = 211112088469632.

The previous prime is 211112120201201. The next prime is 211112120201233. The reversal of 211112120201221 is 122102021211112.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 94562282770596 + 116549837430625 = 9724314^2 + 10795825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211112120201221 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 (211112120201201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1626156 + ... + 20612341.

It is an arithmetic number, because the mean of its divisors is an integer number (52778037983203).

Almost surely, 2^{211112120201221} is an apocalyptic number.

It is an amenable number.

211112120201221 is a deficient number, since it is larger than the sum of its proper divisors (31731591).

211112120201221 is an equidigital number, since it uses as much as digits as its factorization.

211112120201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31731590.

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

Adding to 211112120201221 its reverse (122102021211112), we get a palindrome (333214141412333).

The spelling of 211112120201221 in words is "two hundred eleven trillion, one hundred twelve billion, one hundred twenty million, two hundred one thousand, two hundred twenty-one".