1022122221221 has 4 divisors (see below), whose sum is σ = 1022317399692. Its totient is φ = 1021927042752.

The previous prime is 1022122221209. The next prime is 1022122221257. The reversal of 1022122221221 is 1221222212201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 368587408996 + 653534812225 = 607114^2 + 808415^2 .

It is a cyclic number.

It is not a de Polignac number, because 1022122221221 - 2²⁶ = 1022055112357 is a prime.

It is a super-2 number, since 2×1022122221221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1022122221193 and 1022122221202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022122221121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97581380 + ... + 97591853.

It is an arithmetic number, because the mean of its divisors is an integer number (255579349923).

Almost surely, 2^{1022122221221} is an apocalyptic number.

It is an amenable number.

1022122221221 is a deficient number, since it is larger than the sum of its proper divisors (195178471).

1022122221221 is an equidigital number, since it uses as much as digits as its factorization.

1022122221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195178470.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 1022122221221 its reverse (1221222212201), we get a palindrome (2243344433422).

The spelling of 1022122221221 in words is "one trillion, twenty-two billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty-one".