1221201202111 has 16 divisors (see below), whose sum is σ = 1355680250496. Its totient is φ = 1090800100000.

The previous prime is 1221201202103. The next prime is 1221201202121. The reversal of 1221201202111 is 1112021021221.

It is a cyclic number.

It is not a de Polignac number, because 1221201202111 - 2³ = 1221201202103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221201202121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4049845 + ... + 4340926.

It is an arithmetic number, because the mean of its divisors is an integer number (84730015656).

Almost surely, 2^{1221201202111} is an apocalyptic number.

1221201202111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1221201202111 is a deficient number, since it is larger than the sum of its proper divisors (134479048385).

1221201202111 is a wasteful number, since it uses less digits than its factorization.

1221201202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8391014.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221201202111 its reverse (1112021021221), we get a palindrome (2333222223332).

It can be divided in two parts, 122120 and 1202111, that added together give a palindrome (1324231).

The spelling of 1221201202111 in words is "one trillion, two hundred twenty-one billion, two hundred one million, two hundred two thousand, one hundred eleven".