1211110120221 has 8 divisors (see below), whose sum is σ = 1614958092384. Its totient is φ = 807334447440.

The previous prime is 1211110120201. The next prime is 1211110120343. The reversal of 1211110120221 is 1220210111121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211110120221 - 2⁷ = 1211110120093 is a prime.

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 1211110120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211110120201) 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, 18035746 + ... + 18102771.

It is an arithmetic number, because the mean of its divisors is an integer number (201869761548).

Almost surely, 2^{1211110120221} is an apocalyptic number.

It is an amenable number.

1211110120221 is a deficient number, since it is larger than the sum of its proper divisors (403847972163).

1211110120221 is a wasteful number, since it uses less digits than its factorization.

1211110120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36149691.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211110120221 its reverse (1220210111121), we get a palindrome (2431320231342).

It can be divided in two parts, 1211110 and 120221, that added together give a palindrome (1331331).

The spelling of 1211110120221 in words is "one trillion, two hundred eleven billion, one hundred ten million, one hundred twenty thousand, two hundred twenty-one".