211111000221 has 16 divisors (see below), whose sum is σ = 307124682048. Its totient is φ = 127923504000.

The previous prime is 211111000201. The next prime is 211111000237. The reversal of 211111000221 is 122000111112.

It is not a de Polignac number, because 211111000221 - 2⁵ = 211111000189 is a prime.

It is a super-2 number, since 2×211111000221² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211111000197 and 211111000206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211111000201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 372936 + ... + 749201.

It is an arithmetic number, because the mean of its divisors is an integer number (19195292628).

Almost surely, 2^211111000221 is an apocalyptic number.

It is an amenable number.

211111000221 is a deficient number, since it is larger than the sum of its proper divisors (96013681827).

211111000221 is a wasteful number, since it uses less digits than its factorization.

211111000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127852.

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

Adding to 211111000221 its reverse (122000111112), we get a palindrome (333111111333).

The spelling of 211111000221 in words is "two hundred eleven billion, one hundred eleven million, two hundred twenty-one", and thus it is an aban number.