211111030221 has 64 divisors (see below), whose sum is σ = 352685093376. Its totient is φ = 109353369600.

The previous prime is 211111030217. The next prime is 211111030241. The reversal of 211111030221 is 122030111112.

It is not a de Polignac number, because 211111030221 - 2² = 211111030217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211111030221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211111030241) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10664685 + ... + 10684461.

It is an arithmetic number, because the mean of its divisors is an integer number (5510704584).

Almost surely, 2^211111030221 is an apocalyptic number.

211111030221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

211111030221 is a deficient number, since it is larger than the sum of its proper divisors (141574063155).

211111030221 is a wasteful number, since it uses less digits than its factorization.

211111030221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20502.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 211111030221 its reverse (122030111112), we get a palindrome (333141141333).

The spelling of 211111030221 in words is "two hundred eleven billion, one hundred eleven million, thirty thousand, two hundred twenty-one".