101730021 has 4 divisors (see below), whose sum is σ = 135640032. Its totient is φ = 67820012.

The previous prime is 101730017. The next prime is 101730067. The reversal of 101730021 is 120037101.

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.

It is a cyclic number.

It is not a de Polignac number, because 101730021 - 2² = 101730017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101730071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16955001 + ... + 16955006.

It is an arithmetic number, because the mean of its divisors is an integer number (33910008).

Almost surely, 2^101730021 is an apocalyptic number.

It is an amenable number.

101730021 is a deficient number, since it is larger than the sum of its proper divisors (33910011).

101730021 is an equidigital number, since it uses as much as digits as its factorization.

101730021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33910010.

The product of its (nonzero) digits is 42, while the sum is 15.

The square root of 101730021 is about 10086.1301300350. The cubic root of 101730021 is about 466.8202763592.

Adding to 101730021 its reverse (120037101), we get a palindrome (221767122).

The spelling of 101730021 in words is "one hundred one million, seven hundred thirty thousand, twenty-one".