11206220621 has 2 divisors, whose sum is σ = 11206220622. Its totient is φ = 11206220620.

The previous prime is 11206220611. The next prime is 11206220657. The reversal of 11206220621 is 12602260211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6947222500 + 4258998121 = 83350^2 + 65261^2 .

It is a cyclic number.

It is not a de Polignac number, because 11206220621 - 2²⁶ = 11139111757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11206220611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5603110310 + 5603110311.

It is an arithmetic number, because the mean of its divisors is an integer number (5603110311).

Almost surely, 2^11206220621 is an apocalyptic number.

It is an amenable number.

11206220621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11206220621 is an equidigital number, since it uses as much as digits as its factorization.

11206220621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 11206220621 its reverse (12602260211), we get a palindrome (23808480832).

The spelling of 11206220621 in words is "eleven billion, two hundred six million, two hundred twenty thousand, six hundred twenty-one".