1002001201221 has 16 divisors (see below), whose sum is σ = 1344701244224. Its totient is φ = 663664990464.

The previous prime is 1002001201217. The next prime is 1002001201241. The reversal of 1002001201221 is 1221021002001.

It is not a de Polignac number, because 1002001201221 - 2² = 1002001201217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002001201197 and 1002001201206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002001201241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1464946 + ... + 2037171.

It is an arithmetic number, because the mean of its divisors is an integer number (84043827764).

Almost surely, 2^{1002001201221} is an apocalyptic number.

It is an amenable number.

1002001201221 is a deficient number, since it is larger than the sum of its proper divisors (342700043003).

1002001201221 is a wasteful number, since it uses less digits than its factorization.

1002001201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3502740.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1002001201221 its reverse (1221021002001), we get a palindrome (2223022203222).

The spelling of 1002001201221 in words is "one trillion, two billion, one million, two hundred one thousand, two hundred twenty-one".