1221103201001 has 2 divisors, whose sum is σ = 1221103201002. Its totient is φ = 1221103201000.

The previous prime is 1221103200991. The next prime is 1221103201039. The reversal of 1221103201001 is 1001023011221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1145972391001 + 75130810000 = 1070501^2 + 274100^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221103201001 - 2¹⁴ = 1221103184617 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221103281001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610551600500 + 610551600501.

It is an arithmetic number, because the mean of its divisors is an integer number (610551600501).

Almost surely, 2^{1221103201001} is an apocalyptic number.

It is an amenable number.

1221103201001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221103201001 is an equidigital number, since it uses as much as digits as its factorization.

1221103201001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1221103201001 its reverse (1001023011221), we get a palindrome (2222126212222).

The spelling of 1221103201001 in words is "one trillion, two hundred twenty-one billion, one hundred three million, two hundred one thousand, one".