1221022022211 has 24 divisors (see below), whose sum is σ = 1767939613440. Its totient is φ = 812057708016.

The previous prime is 1221022022201. The next prime is 1221022022279. The reversal of 1221022022211 is 1122202201221.

It is a happy number.

1221022022211 is a `hidden beast` number, since 1 + 2 + 210 + 220 + 22 + 211 = 666.

It is not a de Polignac number, because 1221022022211 - 2¹⁹ = 1221021497923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221022022201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43458810 + ... + 43486896.

It is an arithmetic number, because the mean of its divisors is an integer number (73664150560).

Almost surely, 2^{1221022022211} is an apocalyptic number.

1221022022211 is a deficient number, since it is larger than the sum of its proper divisors (546917591229).

1221022022211 is a wasteful number, since it uses less digits than its factorization.

1221022022211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39535 (or 39532 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1221022022211 its reverse (1122202201221), we get a palindrome (2343224223432).

The spelling of 1221022022211 in words is "one trillion, two hundred twenty-one billion, twenty-two million, twenty-two thousand, two hundred eleven".