1201221002221 has 4 divisors (see below), whose sum is σ = 1201321509532. Its totient is φ = 1201120494912.

The previous prime is 1201221002207. The next prime is 1201221002227. The reversal of 1201221002221 is 1222001221021.

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 946756244196 + 254464758025 = 973014^2 + 504445^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201221002221 - 2²³ = 1201212613613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1201221002195 and 1201221002204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201221002227) 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, 50235726 + ... + 50259631.

It is an arithmetic number, because the mean of its divisors is an integer number (300330377383).

Almost surely, 2^{1201221002221} is an apocalyptic number.

It is an amenable number.

1201221002221 is a deficient number, since it is larger than the sum of its proper divisors (100507311).

1201221002221 is a wasteful number, since it uses less digits than its factorization.

1201221002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100507310.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1201221002221 its reverse (1222001221021), we get a palindrome (2423222223242).

The spelling of 1201221002221 in words is "one trillion, two hundred one billion, two hundred twenty-one million, two thousand, two hundred twenty-one".