11221203121 has 8 divisors (see below), whose sum is σ = 11608706088. Its totient is φ = 10839120000.

The previous prime is 11221203079. The next prime is 11221203139. The reversal of 11221203121 is 12130212211.

It can be written as a sum of positive squares in 4 ways, for example, as 4849172496 + 6372030625 = 69636^2 + 79825^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 11221203121 - 2²¹ = 11219105969 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11221203095 and 11221203104.

It is not an unprimeable number, because it can be changed into a prime (11221203181) 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 7 ways as a sum of consecutive naturals, for example, 1350750 + ... + 1359031.

It is an arithmetic number, because the mean of its divisors is an integer number (1451088261).

Almost surely, 2^11221203121 is an apocalyptic number.

It is an amenable number.

11221203121 is a deficient number, since it is larger than the sum of its proper divisors (387502967).

11221203121 is a wasteful number, since it uses less digits than its factorization.

11221203121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2709923.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 11221203121 its reverse (12130212211), we get a palindrome (23351415332).

The spelling of 11221203121 in words is "eleven billion, two hundred twenty-one million, two hundred three thousand, one hundred twenty-one".