106600721 has 4 divisors (see below), whose sum is σ = 106731072. Its totient is φ = 106470372.

The previous prime is 106600691. The next prime is 106600751. The reversal of 106600721 is 127006601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127006601 = 3583 ⋅35447.

It is an interprime number because it is at equal distance from previous prime (106600691) and next prime (106600751).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-106600721 is a prime.

It is a super-2 number, since 2×106600721² = 22727427435439682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (106600751) 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, 63941 + ... + 65586.

It is an arithmetic number, because the mean of its divisors is an integer number (26682768).

Almost surely, 2^106600721 is an apocalyptic number.

It is an amenable number.

106600721 is a deficient number, since it is larger than the sum of its proper divisors (130351).

106600721 is an equidigital number, since it uses as much as digits as its factorization.

106600721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130350.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 106600721 is about 10324.7625154286. The cubic root of 106600721 is about 474.1546864089.

The spelling of 106600721 in words is "one hundred six million, six hundred thousand, seven hundred twenty-one".