11109898421 has 2 divisors, whose sum is σ = 11109898422. Its totient is φ = 11109898420.

The previous prime is 11109898411. The next prime is 11109898447. The reversal of 11109898421 is 12489890111.

11109898421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6870586321 + 4239312100 = 82889^2 + 65110^2 .

It is a cyclic number.

It is not a de Polignac number, because 11109898421 - 2¹⁴ = 11109882037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11109898411) 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, 5554949210 + 5554949211.

It is an arithmetic number, because the mean of its divisors is an integer number (5554949211).

Almost surely, 2^11109898421 is an apocalyptic number.

It is an amenable number.

11109898421 is a deficient number, since it is larger than the sum of its proper divisors (1).

11109898421 is an equidigital number, since it uses as much as digits as its factorization.

11109898421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 44.

The spelling of 11109898421 in words is "eleven billion, one hundred nine million, eight hundred ninety-eight thousand, four hundred twenty-one".