211110100221 has 4 divisors (see below), whose sum is σ = 281480133632. Its totient is φ = 140740066812.

The previous prime is 211110100217. The next prime is 211110100249. The reversal of 211110100221 is 122001011112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 211110100221 - 2² = 211110100217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211110100197 and 211110100206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211110100121) 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, 35185016701 + ... + 35185016706.

It is an arithmetic number, because the mean of its divisors is an integer number (70370033408).

Almost surely, 2^211110100221 is an apocalyptic number.

It is an amenable number.

211110100221 is a deficient number, since it is larger than the sum of its proper divisors (70370033411).

211110100221 is an equidigital number, since it uses as much as digits as its factorization.

211110100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70370033410.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 211110100221 its reverse (122001011112), we get a palindrome (333111111333).

The spelling of 211110100221 in words is "two hundred eleven billion, one hundred ten million, one hundred thousand, two hundred twenty-one".