2211011112221 has 8 divisors (see below), whose sum is σ = 2212612182840. Its totient is φ = 2209410611712.

The previous prime is 2211011112203. The next prime is 2211011112263. The reversal of 2211011112221 is 1222111101122.

It can be written as a sum of positive squares in 4 ways, for example, as 508638549721 + 1702372562500 = 713189^2 + 1304750^2 .

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 2211011112221 - 2¹⁴ = 2211011095837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2211011112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211011112421) 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, 7775081 + ... + 8054433.

It is an arithmetic number, because the mean of its divisors is an integer number (276576522855).

Almost surely, 2^{2211011112221} is an apocalyptic number.

It is an amenable number.

2211011112221 is a deficient number, since it is larger than the sum of its proper divisors (1601070619).

2211011112221 is a wasteful number, since it uses less digits than its factorization.

2211011112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285055.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2211011112221 its reverse (1222111101122), we get a palindrome (3433122213343).

It can be divided in two parts, 2211011 and 112221, that added together give a palindrome (2323232).

The spelling of 2211011112221 in words is "two trillion, two hundred eleven billion, eleven million, one hundred twelve thousand, two hundred twenty-one".