1220211202111 has 16 divisors (see below), whose sum is σ = 1374177927168. Its totient is φ = 1073422677600.

The previous prime is 1220211202097. The next prime is 1220211202127. The reversal of 1220211202111 is 1112021120221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220211202111 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 (1220211202151) 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, 4930450 + ... + 5172016.

It is an arithmetic number, because the mean of its divisors is an integer number (85886120448).

Almost surely, 2^{1220211202111} is an apocalyptic number.

1220211202111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1220211202111 is a deficient number, since it is larger than the sum of its proper divisors (153966725057).

1220211202111 is a wasteful number, since it uses less digits than its factorization.

1220211202111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256422.

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

Adding to 1220211202111 its reverse (1112021120221), we get a palindrome (2332232322332).

The spelling of 1220211202111 in words is "one trillion, two hundred twenty billion, two hundred eleven million, two hundred two thousand, one hundred eleven".