1222122122021 has 2 divisors, whose sum is σ = 1222122122022. Its totient is φ = 1222122122020.

The previous prime is 1222122121999. The next prime is 1222122122071. The reversal of 1222122122021 is 1202212212221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 673950693025 + 548171428996 = 820945^2 + 740386^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222122122021 - 2²² = 1222117927717 is a prime.

It is a super-2 number, since 2×1222122122021² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1222122121984 and 1222122122002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222122122071) 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 as a sum of consecutive naturals, namely, 611061061010 + 611061061011.

It is an arithmetic number, because the mean of its divisors is an integer number (611061061011).

Almost surely, 2^{1222122122021} is an apocalyptic number.

It is an amenable number.

1222122122021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222122122021 is an equidigital number, since it uses as much as digits as its factorization.

1222122122021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 1222122122021 its reverse (1202212212221), we get a palindrome (2424334334242).

The spelling of 1222122122021 in words is "one trillion, two hundred twenty-two billion, one hundred twenty-two million, one hundred twenty-two thousand, twenty-one".