106371721 has 4 divisors (see below), whose sum is σ = 107653392. Its totient is φ = 105090052.

The previous prime is 106371673. The next prime is 106371751. The reversal of 106371721 is 127173601.

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: 127173601 = 23 ⋅5529287.

It is a cyclic number.

It is not a de Polignac number, because 106371721 - 2⁷ = 106371593 is a prime.

It is a super-2 number, since 2×106371721² = 22629886057003682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 106371721.

It is not an unprimeable number, because it can be changed into a prime (106371751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640711 + ... + 640876.

It is an arithmetic number, because the mean of its divisors is an integer number (26913348).

Almost surely, 2^106371721 is an apocalyptic number.

It is an amenable number.

106371721 is a deficient number, since it is larger than the sum of its proper divisors (1281671).

106371721 is an equidigital number, since it uses as much as digits as its factorization.

106371721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281670.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 106371721 is about 10313.6667097594. Note that the first 3 decimals coincide. The cubic root of 106371721 is about 473.8149161374.

The spelling of 106371721 in words is "one hundred six million, three hundred seventy-one thousand, seven hundred twenty-one".