106817721 has 8 divisors (see below), whose sum is σ = 142574784. Its totient is φ = 71136240.

The previous prime is 106817663. The next prime is 106817731. The reversal of 106817721 is 127718601.

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

It is not a de Polignac number, because 106817721 - 2⁹ = 106817209 is a prime.

It is a super-2 number, since 2×106817721² = 22820051039267682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (106817731) 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, 15510 + ... + 21311.

It is an arithmetic number, because the mean of its divisors is an integer number (17821848).

Almost surely, 2^106817721 is an apocalyptic number.

It is an amenable number.

106817721 is a deficient number, since it is larger than the sum of its proper divisors (35757063).

106817721 is an equidigital number, since it uses as much as digits as its factorization.

106817721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37791.

The product of its (nonzero) digits is 4704, while the sum is 33.

The square root of 106817721 is about 10335.2658891777. The cubic root of 106817721 is about 474.4762034003.

The spelling of 106817721 in words is "one hundred six million, eight hundred seventeen thousand, seven hundred twenty-one".