1001201201221 has 8 divisors (see below), whose sum is σ = 1078940820440. Its totient is φ = 923565030912.

The previous prime is 1001201201149. The next prime is 1001201201249. The reversal of 1001201201221 is 1221021021001.

1001201201221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 20338752996 + 980862448225 = 142614^2 + 990385^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001201201221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001201201291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25842120 + ... + 25880833.

It is an arithmetic number, because the mean of its divisors is an integer number (134867602555).

Almost surely, 2^{1001201201221} is an apocalyptic number.

It is an amenable number.

1001201201221 is a deficient number, since it is larger than the sum of its proper divisors (77739619219).

1001201201221 is a wasteful number, since it uses less digits than its factorization.

1001201201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51724455.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1001201201221 its reverse (1221021021001), we get a palindrome (2222222222222).

The spelling of 1001201201221 in words is "one trillion, one billion, two hundred one million, two hundred one thousand, two hundred twenty-one".