1200002221001 has 4 divisors (see below), whose sum is σ = 1200009214404. Its totient is φ = 1199995227600.

The previous prime is 1200002220877. The next prime is 1200002221039. The reversal of 1200002221001 is 1001222000021.

It is a happy number.

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 835094407225 + 364907813776 = 913835^2 + 604076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200002221001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200002221051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3232670 + ... + 3584711.

It is an arithmetic number, because the mean of its divisors is an integer number (300002303601).

Almost surely, 2^{1200002221001} is an apocalyptic number.

It is an amenable number.

1200002221001 is a deficient number, since it is larger than the sum of its proper divisors (6993403).

1200002221001 is an equidigital number, since it uses as much as digits as its factorization.

1200002221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6993402.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1200002221001 its reverse (1001222000021), we get a palindrome (2201224221022).

The spelling of 1200002221001 in words is "one trillion, two hundred billion, two million, two hundred twenty-one thousand, one".