100722521 has 2 divisors, whose sum is σ = 100722522. Its totient is φ = 100722520.

The previous prime is 100722509. The next prime is 100722533. The reversal of 100722521 is 125227001.

It is a balanced prime because it is at equal distance from previous prime (100722509) and next prime (100722533).

It can be written as a sum of positive squares in only one way, i.e., 100721296 + 1225 = 10036^2 + 35^2 .

It is an emirp because it is prime and its reverse (125227001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100722521 - 2¹⁰ = 100721497 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 100722493 and 100722502.

It is not a weakly prime, because it can be changed into another prime (100722541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50361260 + 50361261.

It is an arithmetic number, because the mean of its divisors is an integer number (50361261).

Almost surely, 2^100722521 is an apocalyptic number.

It is an amenable number.

100722521 is a deficient number, since it is larger than the sum of its proper divisors (1).

100722521 is an equidigital number, since it uses as much as digits as its factorization.

100722521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 100722521 is about 10036.0610301054. The cubic root of 100722521 is about 465.2740836081.

Adding to 100722521 its reverse (125227001), we get a palindrome (225949522).

The spelling of 100722521 in words is "one hundred million, seven hundred twenty-two thousand, five hundred twenty-one".