211011101221 has 8 divisors (see below), whose sum is σ = 212468914944. Its totient is φ = 209554728240.

The previous prime is 211011101183. The next prime is 211011101233. The reversal of 211011101221 is 122101110112.

It is a happy number.

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 211011101221 - 2¹⁵ = 211011068453 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 (211011101281) 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, 65425 + ... + 652918.

It is an arithmetic number, because the mean of its divisors is an integer number (26558614368).

Almost surely, 2^211011101221 is an apocalyptic number.

It is an amenable number.

211011101221 is a deficient number, since it is larger than the sum of its proper divisors (1457813723).

211011101221 is a wasteful number, since it uses less digits than its factorization.

211011101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720371.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 211011101221 its reverse (122101110112), we get a palindrome (333112211333).

The spelling of 211011101221 in words is "two hundred eleven billion, eleven million, one hundred one thousand, two hundred twenty-one".