21650101 has 16 divisors (see below), whose sum is σ = 25228800. Its totient is φ = 18370800.

The previous prime is 21650099. The next prime is 21650117. The reversal of 21650101 is 10105612.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21650101 - 2¹ = 21650099 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21650131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14110 + ... + 15568.

It is an arithmetic number, because the mean of its divisors is an integer number (1576800).

Almost surely, 2^21650101 is an apocalyptic number.

It is an amenable number.

21650101 is a deficient number, since it is larger than the sum of its proper divisors (3578699).

21650101 is a wasteful number, since it uses less digits than its factorization.

21650101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 21650101 is about 4652.9669029556. The cubic root of 21650101 is about 278.7104861979.

Adding to 21650101 its reverse (10105612), we get a palindrome (31755713).

The spelling of 21650101 in words is "twenty-one million, six hundred fifty thousand, one hundred one".