100231332821 has 2 divisors, whose sum is σ = 100231332822. Its totient is φ = 100231332820.

The previous prime is 100231332809. The next prime is 100231332829. The reversal of 100231332821 is 128233132001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99739114225 + 492218596 = 315815^2 + 22186^2 .

It is a cyclic number.

It is not a de Polignac number, because 100231332821 - 2³⁴ = 83051463637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100231332829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50115666410 + 50115666411.

It is an arithmetic number, because the mean of its divisors is an integer number (50115666411).

Almost surely, 2^100231332821 is an apocalyptic number.

It is an amenable number.

100231332821 is a deficient number, since it is larger than the sum of its proper divisors (1).

100231332821 is an equidigital number, since it uses as much as digits as its factorization.

100231332821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 100231332821 its reverse (128233132001), we get a palindrome (228464464822).

The spelling of 100231332821 in words is "one hundred billion, two hundred thirty-one million, three hundred thirty-two thousand, eight hundred twenty-one".