1221102221211 has 16 divisors (see below), whose sum is σ = 1825049538720. Its totient is φ = 806864002560.

The previous prime is 1221102221197. The next prime is 1221102221243. The reversal of 1221102221211 is 1121222011221.

1221102221211 is a `hidden beast` number, since 1 + 221 + 10 + 2 + 221 + 211 = 666.

It is not a de Polignac number, because 1221102221211 - 2⁵ = 1221102221179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221102220211) 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, 200112030 + ... + 200118131.

It is an arithmetic number, because the mean of its divisors is an integer number (114065596170).

Almost surely, 2^{1221102221211} is an apocalyptic number.

1221102221211 is a deficient number, since it is larger than the sum of its proper divisors (603947317509).

1221102221211 is a wasteful number, since it uses less digits than its factorization.

1221102221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400230283 (or 400230277 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1221102221211 its reverse (1121222011221), we get a palindrome (2342324232432).

The spelling of 1221102221211 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two hundred twenty-one thousand, two hundred eleven".