21522541097 has 2 divisors, whose sum is σ = 21522541098. Its totient is φ = 21522541096.

The previous prime is 21522541049. The next prime is 21522541109. The reversal of 21522541097 is 79014522512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21522063616 + 477481 = 146704^2 + 691^2 .

It is a cyclic number.

It is not a de Polignac number, because 21522541097 - 2²⁰ = 21521492521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21522541097.

It is not a weakly prime, because it can be changed into another prime (21522541597) 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, 10761270548 + 10761270549.

It is an arithmetic number, because the mean of its divisors is an integer number (10761270549).

Almost surely, 2^21522541097 is an apocalyptic number.

It is an amenable number.

21522541097 is a deficient number, since it is larger than the sum of its proper divisors (1).

21522541097 is an equidigital number, since it uses as much as digits as its factorization.

21522541097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 21522541097 in words is "twenty-one billion, five hundred twenty-two million, five hundred forty-one thousand, ninety-seven".