21098225569 has 2 divisors, whose sum is σ = 21098225570. Its totient is φ = 21098225568.

The previous prime is 21098225557. The next prime is 21098225713. The reversal of 21098225569 is 96552289012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12986881600 + 8111343969 = 113960^2 + 90063^2 .

It is a cyclic number.

It is not a de Polignac number, because 21098225569 - 2⁷ = 21098225441 is a prime.

It is a super-2 number, since 2×21098225569² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21098225539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10549112784 + 10549112785.

It is an arithmetic number, because the mean of its divisors is an integer number (10549112785).

Almost surely, 2^21098225569 is an apocalyptic number.

It is an amenable number.

21098225569 is a deficient number, since it is larger than the sum of its proper divisors (1).

21098225569 is an equidigital number, since it uses as much as digits as its factorization.

21098225569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 21098225569 in words is "twenty-one billion, ninety-eight million, two hundred twenty-five thousand, five hundred sixty-nine".