109159821 has 6 divisors (see below), whose sum is σ = 157675310. Its totient is φ = 72773208.

The previous prime is 109159793. The next prime is 109159837. The reversal of 109159821 is 128951901.

It can be written as a sum of positive squares in only one way, i.e., 107433225 + 1726596 = 10365^2 + 1314^2 .

It is not a de Polignac number, because 109159821 - 2¹¹ = 109157773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109159861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6064426 + ... + 6064443.

Almost surely, 2^109159821 is an apocalyptic number.

It is an amenable number.

109159821 is a deficient number, since it is larger than the sum of its proper divisors (48515489).

109159821 is a wasteful number, since it uses less digits than its factorization.

109159821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12128875 (or 12128872 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 109159821 is about 10447.9577430233. The cubic root of 109159821 is about 477.9189725695.

It can be divided in two parts, 10915 and 9821, that added together give a 4-th power (20736 = 12⁴).

The spelling of 109159821 in words is "one hundred nine million, one hundred fifty-nine thousand, eight hundred twenty-one".