211111002222221 has 8 divisors (see below), whose sum is σ = 211326040172544. Its totient is φ = 210895968325680.

The previous prime is 211111002222217. The next prime is 211111002222227. The reversal of 211111002222221 is 122222200111112.

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 211111002222221 - 2² = 211111002222217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211111002222193 and 211111002222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211111002222227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109304315 + ... + 111218951.

It is an arithmetic number, because the mean of its divisors is an integer number (26415755021568).

Almost surely, 2^{211111002222221} is an apocalyptic number.

It is an amenable number.

211111002222221 is a deficient number, since it is larger than the sum of its proper divisors (215037950323).

211111002222221 is a wasteful number, since it uses less digits than its factorization.

211111002222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2026891.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 211111002222221 its reverse (122222200111112), we get a palindrome (333333202333333).

The spelling of 211111002222221 in words is "two hundred eleven trillion, one hundred eleven billion, two million, two hundred twenty-two thousand, two hundred twenty-one".