21716101 has 16 divisors (see below), whose sum is σ = 24494400. Its totient is φ = 19081600.

The previous prime is 21716087. The next prime is 21716137. The reversal of 21716101 is 10161712.

It is a cyclic number.

It is not a de Polignac number, because 21716101 - 2¹¹ = 21714053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21711101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80595 + ... + 80863.

It is an arithmetic number, because the mean of its divisors is an integer number (1530900).

Almost surely, 2^21716101 is an apocalyptic number.

It is an amenable number.

21716101 is a deficient number, since it is larger than the sum of its proper divisors (2778299).

21716101 is a wasteful number, since it uses less digits than its factorization.

21716101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500.

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

The square root of 21716101 is about 4660.0537550548. The cubic root of 21716101 is about 278.9934137695.

Adding to 21716101 its reverse (10161712), we get a palindrome (31877813).

The spelling of 21716101 in words is "twenty-one million, seven hundred sixteen thousand, one hundred one".