100522171921 has 2 divisors, whose sum is σ = 100522171922. Its totient is φ = 100522171920.

The previous prime is 100522171873. The next prime is 100522172017. The reversal of 100522171921 is 129171225001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100428779025 + 93392896 = 316905^2 + 9664^2 .

It is a cyclic number.

It is not a de Polignac number, because 100522171921 - 2³³ = 91932237329 is a prime.

It is not a weakly prime, because it can be changed into another prime (100522171621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50261085960 + 50261085961.

It is an arithmetic number, because the mean of its divisors is an integer number (50261085961).

Almost surely, 2^100522171921 is an apocalyptic number.

It is an amenable number.

100522171921 is a deficient number, since it is larger than the sum of its proper divisors (1).

100522171921 is an equidigital number, since it uses as much as digits as its factorization.

100522171921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 31.

Adding to 100522171921 its reverse (129171225001), we get a palindrome (229693396922).

The spelling of 100522171921 in words is "one hundred billion, five hundred twenty-two million, one hundred seventy-one thousand, nine hundred twenty-one".