8212133561 has 2 divisors, whose sum is σ = 8212133562. Its totient is φ = 8212133560.

The previous prime is 8212133537. The next prime is 8212133569. The reversal of 8212133561 is 1653312128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5666325625 + 2545807936 = 75275^2 + 50456^2 .

It is a cyclic number.

It is not a de Polignac number, because 8212133561 - 2⁶ = 8212133497 is a prime.

It is not a weakly prime, because it can be changed into another prime (8212133569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4106066780 + 4106066781.

It is an arithmetic number, because the mean of its divisors is an integer number (4106066781).

Almost surely, 2^8212133561 is an apocalyptic number.

It is an amenable number.

8212133561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8212133561 is an equidigital number, since it uses as much as digits as its factorization.

8212133561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 8212133561 is about 90620.8229989112. The cubic root of 8212133561 is about 2017.5238064146.

Adding to 8212133561 its reverse (1653312128), we get a palindrome (9865445689).

The spelling of 8212133561 in words is "eight billion, two hundred twelve million, one hundred thirty-three thousand, five hundred sixty-one".