1221200210111 has 8 divisors (see below), whose sum is σ = 1469113034880. Its totient is φ = 991651298328.

The previous prime is 1221200210077. The next prime is 1221200210183. The reversal of 1221200210111 is 1110120021221.

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 1221200210111 - 2²² = 1221196015807 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 (1221200216111) 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, 4590978101 + ... + 4590978366.

It is an arithmetic number, because the mean of its divisors is an integer number (183639129360).

Almost surely, 2^{1221200210111} is an apocalyptic number.

1221200210111 is a deficient number, since it is larger than the sum of its proper divisors (247912824769).

1221200210111 is an equidigital number, since it uses as much as digits as its factorization.

1221200210111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9181956493.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1221200210111 its reverse (1110120021221), we get a palindrome (2331320231332).

The spelling of 1221200210111 in words is "one trillion, two hundred twenty-one billion, two hundred million, two hundred ten thousand, one hundred eleven".