101721 has 8 divisors (see below), whose sum is σ = 139104. Its totient is φ = 66080.

The previous prime is 101719. The next prime is 101723. The reversal of 101721 is 127101.

It is an interprime number because it is at equal distance from previous prime (101719) and next prime (101723).

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

It is a cyclic number.

It is not a de Polignac number, because 101721 - 2¹ = 101719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101697 and 101706.

It is not an unprimeable number, because it can be changed into a prime (101723) 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, 291 + ... + 536.

It is an arithmetic number, because the mean of its divisors is an integer number (17388).

2¹⁰¹⁷²¹ is an apocalyptic number.

It is an amenable number.

101721 is a deficient number, since it is larger than the sum of its proper divisors (37383).

101721 is an equidigital number, since it uses as much as digits as its factorization.

101721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871.

The product of its (nonzero) digits is 14, while the sum is 12.

The square root of 101721 is about 318.9372979129. The cubic root of 101721 is about 46.6806477384.

Adding to 101721 its reverse (127101), we get a palindrome (228822).

The spelling of 101721 in words is "one hundred one thousand, seven hundred twenty-one", and thus it is an iban number.