1221323422001 has 2 divisors, whose sum is σ = 1221323422002. Its totient is φ = 1221323422000.

The previous prime is 1221323421973. The next prime is 1221323422037. The reversal of 1221323422001 is 1002243231221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1098262080400 + 123061341601 = 1047980^2 + 350801^2 .

It is an emirp because it is prime and its reverse (1002243231221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221323422001 - 2²² = 1221319227697 is a prime.

It is a super-2 number, since 2×1221323422001² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221323422061) 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, 610661711000 + 610661711001.

It is an arithmetic number, because the mean of its divisors is an integer number (610661711001).

Almost surely, 2^{1221323422001} is an apocalyptic number.

It is an amenable number.

1221323422001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221323422001 is an equidigital number, since it uses as much as digits as its factorization.

1221323422001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 1221323422001 its reverse (1002243231221), we get a palindrome (2223566653222).

The spelling of 1221323422001 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-three million, four hundred twenty-two thousand, one".