21101100109559 has 2 divisors, whose sum is σ = 21101100109560. Its totient is φ = 21101100109558.

The previous prime is 21101100109541. The next prime is 21101100109633. The reversal of 21101100109559 is 95590100110112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21101100109559 - 2¹⁶ = 21101100044023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101100169559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550550054779 + 10550550054780.

It is an arithmetic number, because the mean of its divisors is an integer number (10550550054780).

Almost surely, 2^{21101100109559} is an apocalyptic number.

21101100109559 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101100109559 is an equidigital number, since it uses as much as digits as its factorization.

21101100109559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4050, while the sum is 35.

The spelling of 21101100109559 in words is "twenty-one trillion, one hundred one billion, one hundred million, one hundred nine thousand, five hundred fifty-nine".