21736106 has 12 divisors (see below), whose sum is σ = 37927458. Its totient is φ = 9315432.

The previous prime is 21736103. The next prime is 21736111. The reversal of 21736106 is 60163712.

It can be written as a sum of positive squares in only one way, i.e., 21669025 + 67081 = 4655^2 + 259^2 .

It is not an unprimeable number, because it can be changed into a prime (21736103) 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 5 ways as a sum of consecutive naturals, for example, 110801 + ... + 110996.

Almost surely, 2^21736106 is an apocalyptic number.

21736106 is a deficient number, since it is larger than the sum of its proper divisors (16191352).

21736106 is a wasteful number, since it uses less digits than its factorization.

21736106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221813 (or 221806 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21736106 is about 4662.1996954228. The cubic root of 21736106 is about 279.0790576010.

Adding to 21736106 its reverse (60163712), we get a palindrome (81899818).

The spelling of 21736106 in words is "twenty-one million, seven hundred thirty-six thousand, one hundred six".