101721207 has 24 divisors (see below), whose sum is σ = 161139456. Its totient is φ = 56885808.

The previous prime is 101721181. The next prime is 101721259. The reversal of 101721207 is 702127101.

It is a happy number.

It is not a de Polignac number, because 101721207 - 2⁶ = 101721143 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101721707) 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 23 ways as a sum of consecutive naturals, for example, 453 + ... + 14270.

It is an arithmetic number, because the mean of its divisors is an integer number (6714144).

Almost surely, 2^101721207 is an apocalyptic number.

101721207 is a deficient number, since it is larger than the sum of its proper divisors (59418249).

101721207 is a wasteful number, since it uses less digits than its factorization.

101721207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14787 (or 14780 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 21.

The square root of 101721207 is about 10085.6931839116. The cubic root of 101721207 is about 466.8067940304.

Adding to 101721207 its reverse (702127101), we get a palindrome (803848308).

The spelling of 101721207 in words is "one hundred one million, seven hundred twenty-one thousand, two hundred seven".