106909921 has 4 divisors (see below), whose sum is σ = 110596500. Its totient is φ = 103223344.

The previous prime is 106909897. The next prime is 106909949. The reversal of 106909921 is 129909601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40259025 + 66650896 = 6345^2 + 8164^2 .

It is a cyclic number.

It is not a de Polignac number, because 106909921 - 2¹⁹ = 106385633 is a prime.

It is a super-2 number, since 2×106909921² = 22859462416452482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (106909951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1843246 + ... + 1843303.

It is an arithmetic number, because the mean of its divisors is an integer number (27649125).

Almost surely, 2^106909921 is an apocalyptic number.

It is an amenable number.

106909921 is a deficient number, since it is larger than the sum of its proper divisors (3686579).

106909921 is an equidigital number, since it uses as much as digits as its factorization.

106909921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3686578.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 106909921 is about 10339.7253832005. The cubic root of 106909921 is about 474.6126792737.

The spelling of 106909921 in words is "one hundred six million, nine hundred nine thousand, nine hundred twenty-one".