11220202121 has 2 divisors, whose sum is σ = 11220202122. Its totient is φ = 11220202120.

The previous prime is 11220202117. The next prime is 11220202129. The reversal of 11220202121 is 12120202211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11138480521 + 81721600 = 105539^2 + 9040^2 .

It is a cyclic number.

It is not a de Polignac number, because 11220202121 - 2² = 11220202117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11220202096 and 11220202105.

It is not a weakly prime, because it can be changed into another prime (11220202129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610101060 + 5610101061.

It is an arithmetic number, because the mean of its divisors is an integer number (5610101061).

Almost surely, 2^11220202121 is an apocalyptic number.

It is an amenable number.

11220202121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11220202121 is an equidigital number, since it uses as much as digits as its factorization.

11220202121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 11220202121 its reverse (12120202211), we get a palindrome (23340404332).

The spelling of 11220202121 in words is "eleven billion, two hundred twenty million, two hundred two thousand, one hundred twenty-one".