21695499101 has 2 divisors, whose sum is σ = 21695499102. Its totient is φ = 21695499100.

The previous prime is 21695499037. The next prime is 21695499131. The reversal of 21695499101 is 10199459612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12933603076 + 8761896025 = 113726^2 + 93605^2 .

It is a cyclic number.

It is not a de Polignac number, because 21695499101 - 2⁶ = 21695499037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21695499131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10847749550 + 10847749551.

It is an arithmetic number, because the mean of its divisors is an integer number (10847749551).

Almost surely, 2^21695499101 is an apocalyptic number.

It is an amenable number.

21695499101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21695499101 is an equidigital number, since it uses as much as digits as its factorization.

21695499101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 47.

The spelling of 21695499101 in words is "twenty-one billion, six hundred ninety-five million, four hundred ninety-nine thousand, one hundred one".