1022221121221 has 16 divisors (see below), whose sum is σ = 1027242881280. Its totient is φ = 1017215704960.

The previous prime is 1022221121189. The next prime is 1022221121231. The reversal of 1022221121221 is 1221211222201.

It is a cyclic number.

It is not a de Polignac number, because 1022221121221 - 2⁵ = 1022221121189 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 (1022221121231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 489803040 + ... + 489805126.

It is an arithmetic number, because the mean of its divisors is an integer number (64202680080).

Almost surely, 2^{1022221121221} is an apocalyptic number.

It is an amenable number.

1022221121221 is a deficient number, since it is larger than the sum of its proper divisors (5021760059).

1022221121221 is a wasteful number, since it uses less digits than its factorization.

1022221121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4964.

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

Adding to 1022221121221 its reverse (1221211222201), we get a palindrome (2243432343422).

The spelling of 1022221121221 in words is "one trillion, twenty-two billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".