109218921909 has 16 divisors (see below), whose sum is σ = 158575569600. Its totient is φ = 66601737216.

The previous prime is 109218921907. The next prime is 109218921913. The reversal of 109218921909 is 909129812901.

It is not a de Polignac number, because 109218921909 - 2¹ = 109218921907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109218921907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33034924 + ... + 33038229.

It is an arithmetic number, because the mean of its divisors is an integer number (9910973100).

Almost surely, 2^109218921909 is an apocalyptic number.

109218921909 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

109218921909 is a deficient number, since it is larger than the sum of its proper divisors (49356647691).

109218921909 is a wasteful number, since it uses less digits than its factorization.

109218921909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66073204.

The product of its (nonzero) digits is 209952, while the sum is 51.

The spelling of 109218921909 in words is "one hundred nine billion, two hundred eighteen million, nine hundred twenty-one thousand, nine hundred nine".