109939821 has 8 divisors (see below), whose sum is σ = 146635104. Its totient is φ = 73268880.

The previous prime is 109939789. The next prime is 109939829. The reversal of 109939821 is 128939901.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 109939821 - 2⁵ = 109939789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109939829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13086 + ... + 19776.

It is an arithmetic number, because the mean of its divisors is an integer number (18329388).

Almost surely, 2^109939821 is an apocalyptic number.

It is an amenable number.

109939821 is a deficient number, since it is larger than the sum of its proper divisors (36695283).

109939821 is an equidigital number, since it uses as much as digits as its factorization.

109939821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12171.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 109939821 is about 10485.2191679526. The cubic root of 109939821 is about 479.0545931445.

The spelling of 109939821 in words is "one hundred nine million, nine hundred thirty-nine thousand, eight hundred twenty-one".