101016721 has 8 divisors (see below), whose sum is σ = 109571840. Its totient is φ = 92573712.

The previous prime is 101016701. The next prime is 101016733. The reversal of 101016721 is 127610101.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101016721 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101016701) 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, 26145 + ... + 29758.

It is an arithmetic number, because the mean of its divisors is an integer number (13696480).

Almost surely, 2^101016721 is an apocalyptic number.

It is an amenable number.

101016721 is a deficient number, since it is larger than the sum of its proper divisors (8555119).

101016721 is a wasteful number, since it uses less digits than its factorization.

101016721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56055.

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 101016721 is about 10050.7074875354. The cubic root of 101016721 is about 465.7266489847.

Adding to 101016721 its reverse (127610101), we get a palindrome (228626822).

The spelling of 101016721 in words is "one hundred one million, sixteen thousand, seven hundred twenty-one".