211111232221 has 8 divisors (see below), whose sum is σ = 220294589760. Its totient is φ = 201928258752.

The previous prime is 211111232197. The next prime is 211111232279. The reversal of 211111232221 is 122232111112.

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 211111232221 - 2⁷ = 211111232093 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 (211111232921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2014506 + ... + 2116708.

It is an arithmetic number, because the mean of its divisors is an integer number (27536823720).

Almost surely, 2^211111232221 is an apocalyptic number.

It is an amenable number.

211111232221 is a deficient number, since it is larger than the sum of its proper divisors (9183357539).

211111232221 is a wasteful number, since it uses less digits than its factorization.

211111232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192035.

The product of its digits is 96, while the sum is 19.

Adding to 211111232221 its reverse (122232111112), we get a palindrome (333343343333).

The spelling of 211111232221 in words is "two hundred eleven billion, one hundred eleven million, two hundred thirty-two thousand, two hundred twenty-one".