1211221323001 has 4 divisors (see below), whose sum is σ = 1213848701604. Its totient is φ = 1208593944400.

The previous prime is 1211221322953. The next prime is 1211221323071. The reversal of 1211221323001 is 1003231221121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 817369687225 + 393851635776 = 904085^2 + 627576^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211221323001 - 2⁹ = 1211221322489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211221323001.

It is not an unprimeable number, because it can be changed into a prime (1211221323071) 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 in 3 ways as a sum of consecutive naturals, for example, 1313688610 + ... + 1313689531.

It is an arithmetic number, because the mean of its divisors is an integer number (303462175401).

Almost surely, 2^{1211221323001} is an apocalyptic number.

It is an amenable number.

1211221323001 is a deficient number, since it is larger than the sum of its proper divisors (2627378603).

1211221323001 is an equidigital number, since it uses as much as digits as its factorization.

1211221323001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2627378602.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1211221323001 its reverse (1003231221121), we get a palindrome (2214452544122).

The spelling of 1211221323001 in words is "one trillion, two hundred eleven billion, two hundred twenty-one million, three hundred twenty-three thousand, one".