1211112210221 has 8 divisors (see below), whose sum is σ = 1222459081344. Its totient is φ = 1199765859040.

The previous prime is 1211112210167. The next prime is 1211112210229. The reversal of 1211112210221 is 1220122111121.

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 1211112210221 - 2³⁴ = 1193932341037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211112210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211112210229) 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, 5819441 + ... + 6023961.

It is an arithmetic number, because the mean of its divisors is an integer number (152807385168).

Almost surely, 2^{1211112210221} is an apocalyptic number.

It is an amenable number.

1211112210221 is a deficient number, since it is larger than the sum of its proper divisors (11346871123).

1211112210221 is a wasteful number, since it uses less digits than its factorization.

1211112210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259971.

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

Adding to 1211112210221 its reverse (1220122111121), we get a palindrome (2431234321342).

It can be divided in two parts, 121111 and 2210221, that added together give a palindrome (2331332).

The spelling of 1211112210221 in words is "one trillion, two hundred eleven billion, one hundred twelve million, two hundred ten thousand, two hundred twenty-one".