109690829808921 has 27 divisors (see below), whose sum is σ = 161887327954261. Its totient is φ = 71570358030264.

The previous prime is 109690829808841. The next prime is 109690829809009. The reversal of 109690829808921 is 129808928096901.

The square root of 109690829808921 is 10473339.

It is a perfect power (a square), and thus also a powerful number.

It is a de Polignac number, because none of the positive numbers 2^k-109690829808921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 109690829808921.

It is not an unprimeable number, because it can be changed into a prime (109690829807921) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1476703660 + ... + 1476777938.

Almost surely, 2^{109690829808921} is an apocalyptic number.

109690829808921 is the 10473339-th square number.

109690829808921 is the 5236670-th centered octagonal number.

It is an amenable number.

109690829808921 is a deficient number, since it is larger than the sum of its proper divisors (52196498145340).

109690829808921 is an frugal number, since it uses more digits than its factorization.

109690829808921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148658 (or 74329 counting only the distinct ones).

The product of its (nonzero) digits is 80621568, while the sum is 72.

The spelling of 109690829808921 in words is "one hundred nine trillion, six hundred ninety billion, eight hundred twenty-nine million, eight hundred eight thousand, nine hundred twenty-one".