1221221201201 has 2 divisors, whose sum is σ = 1221221201202. Its totient is φ = 1221221201200.

The previous prime is 1221221201191. The next prime is 1221221201219. The reversal of 1221221201201 is 1021021221221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 690268518976 + 530952682225 = 830824^2 + 728665^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221221201201 - 2²⁶ = 1221154092337 is a prime.

It is a super-3 number, since 3×1221221201201³ (a number of 37 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1221221201201.

It is not a weakly prime, because it can be changed into another prime (1221221201261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610610600600 + 610610600601.

It is an arithmetic number, because the mean of its divisors is an integer number (610610600601).

Almost surely, 2^{1221221201201} is an apocalyptic number.

It is an amenable number.

1221221201201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221221201201 is an equidigital number, since it uses as much as digits as its factorization.

1221221201201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221221201201 its reverse (1021021221221), we get a palindrome (2242242422422).

The spelling of 1221221201201 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, two hundred one".