106888021 has 4 divisors (see below), whose sum is σ = 108089100. Its totient is φ = 105686944.

The previous prime is 106888007. The next prime is 106888039. The reversal of 106888021 is 120888601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120888601 = 53 ⋅2280917.

It can be written as a sum of positive squares in 2 ways, for example, as 53085796 + 53802225 = 7286^2 + 7335^2 .

It is a cyclic number.

It is not a de Polignac number, because 106888021 - 2²³ = 98499413 is a prime.

It is a super-2 number, since 2×106888021² = 22850098066592882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106888321) 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, 600406 + ... + 600583.

It is an arithmetic number, because the mean of its divisors is an integer number (27022275).

Almost surely, 2^106888021 is an apocalyptic number.

It is an amenable number.

106888021 is a deficient number, since it is larger than the sum of its proper divisors (1201079).

106888021 is an equidigital number, since it uses as much as digits as its factorization.

106888021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201078.

The product of its (nonzero) digits is 6144, while the sum is 34.

The square root of 106888021 is about 10338.6663066374. Note that the first 3 decimals coincide. The cubic root of 106888021 is about 474.5802696608.

The spelling of 106888021 in words is "one hundred six million, eight hundred eighty-eight thousand, twenty-one".