101821209099 has 16 divisors (see below), whose sum is σ = 136027216512. Its totient is φ = 67748067968.

The previous prime is 101821209073. The next prime is 101821209101. The reversal of 101821209099 is 990902128101.

It is a cyclic number.

It is not a de Polignac number, because 101821209099 - 2⁵ = 101821209067 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101821209099.

It is not an unprimeable number, because it can be changed into a prime (101821209199) 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 in 15 ways as a sum of consecutive naturals, for example, 11030524 + ... + 11039750.

It is an arithmetic number, because the mean of its divisors is an integer number (8501701032).

Almost surely, 2^101821209099 is an apocalyptic number.

101821209099 is a deficient number, since it is larger than the sum of its proper divisors (34206007413).

101821209099 is an equidigital number, since it uses as much as digits as its factorization.

101821209099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16026.

The product of its (nonzero) digits is 23328, while the sum is 42.

The spelling of 101821209099 in words is "one hundred one billion, eight hundred twenty-one million, two hundred nine thousand, ninety-nine".