1221022221211 has 16 divisors (see below), whose sum is σ = 1316204225280. Its totient is φ = 1126020263040.

The previous prime is 1221022221179. The next prime is 1221022221233. The reversal of 1221022221211 is 1121222201221.

It is a cyclic number.

It is not a de Polignac number, because 1221022221211 - 2⁵ = 1221022221179 is a prime.

It is a super-4 number, since 4×1221022221211⁴ (a number of 49 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221022221271) 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, 108887841 + ... + 108899053.

It is an arithmetic number, because the mean of its divisors is an integer number (82262764080).

Almost surely, 2^{1221022221211} is an apocalyptic number.

1221022221211 is a deficient number, since it is larger than the sum of its proper divisors (95182004069).

1221022221211 is a wasteful number, since it uses less digits than its factorization.

1221022221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18486.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1221022221211 its reverse (1121222201221), we get a palindrome (2342244422432).

The spelling of 1221022221211 in words is "one trillion, two hundred twenty-one billion, twenty-two million, two hundred twenty-one thousand, two hundred eleven".