88211717821 has 2 divisors, whose sum is σ = 88211717822. Its totient is φ = 88211717820.

The previous prime is 88211717813. The next prime is 88211717827. The reversal of 88211717821 is 12871711288.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 85339936900 + 2871780921 = 292130^2 + 53589^2 .

It is a cyclic number.

It is not a de Polignac number, because 88211717821 - 2³ = 88211717813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (88211717827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44105858910 + 44105858911.

It is an arithmetic number, because the mean of its divisors is an integer number (44105858911).

Almost surely, 2^88211717821 is an apocalyptic number.

It is an amenable number.

88211717821 is a deficient number, since it is larger than the sum of its proper divisors (1).

88211717821 is an equidigital number, since it uses as much as digits as its factorization.

88211717821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100352, while the sum is 46.

The spelling of 88211717821 in words is "eighty-eight billion, two hundred eleven million, seven hundred seventeen thousand, eight hundred twenty-one".