1222201000021 has 2 divisors, whose sum is σ = 1222201000022. Its totient is φ = 1222201000020.

The previous prime is 1222201000019. The next prime is 1222201000043. The reversal of 1222201000021 is 1200001022221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1213051120996 + 9149879025 = 1101386^2 + 95655^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222201000021 - 2¹ = 1222201000019 is a prime.

It is a super-3 number, since 3×1222201000021³ (a number of 37 digits) contains 333 as substring.

Together with 1222201000019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1222200999965 and 1222201000010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222201000061) 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 as a sum of consecutive naturals, namely, 611100500010 + 611100500011.

It is an arithmetic number, because the mean of its divisors is an integer number (611100500011).

Almost surely, 2^{1222201000021} is an apocalyptic number.

It is an amenable number.

1222201000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222201000021 is an equidigital number, since it uses as much as digits as its factorization.

1222201000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1222201000021 its reverse (1200001022221), we get a palindrome (2422202022242).

The spelling of 1222201000021 in words is "one trillion, two hundred twenty-two billion, two hundred one million, twenty-one", and thus it is an aban number.