11220817010621 has 2 divisors, whose sum is σ = 11220817010622. Its totient is φ = 11220817010620.

The previous prime is 11220817010597. The next prime is 11220817010717. The reversal of 11220817010621 is 12601071802211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7857150969721 + 3363666040900 = 2803061^2 + 1834030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11220817010621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11220817013621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5610408505310 + 5610408505311.

It is an arithmetic number, because the mean of its divisors is an integer number (5610408505311).

Almost surely, 2^{11220817010621} is an apocalyptic number.

It is an amenable number.

11220817010621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11220817010621 is an equidigital number, since it uses as much as digits as its factorization.

11220817010621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 32.

Adding to 11220817010621 its reverse (12601071802211), we get a palindrome (23821888812832).

The spelling of 11220817010621 in words is "eleven trillion, two hundred twenty billion, eight hundred seventeen million, ten thousand, six hundred twenty-one".