1221200120211 has 4 divisors (see below), whose sum is σ = 1628266826952. Its totient is φ = 814133413472.

The previous prime is 1221200120209. The next prime is 1221200120221. The reversal of 1221200120211 is 1120210021221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221200120211 - 2¹ = 1221200120209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221200120221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203533353366 + ... + 203533353371.

It is an arithmetic number, because the mean of its divisors is an integer number (407066706738).

Almost surely, 2^{1221200120211} is an apocalyptic number.

1221200120211 is a deficient number, since it is larger than the sum of its proper divisors (407066706741).

1221200120211 is an equidigital number, since it uses as much as digits as its factorization.

1221200120211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407066706740.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221200120211 its reverse (1120210021221), we get a palindrome (2341410141432).

The spelling of 1221200120211 in words is "one trillion, two hundred twenty-one billion, two hundred million, one hundred twenty thousand, two hundred eleven".