21732086 has 16 divisors (see below), whose sum is σ = 36333360. Its totient is φ = 9688320.

The previous prime is 21732077. The next prime is 21732089. The reversal of 21732086 is 68023712.

It is a happy number.

It is a super-2 number, since 2×21732086² = 944567123822792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21732089) 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, 16175 + ... + 17466.

It is an arithmetic number, because the mean of its divisors is an integer number (2270835).

Almost surely, 2^21732086 is an apocalyptic number.

21732086 is a deficient number, since it is larger than the sum of its proper divisors (14601274).

21732086 is a wasteful number, since it uses less digits than its factorization.

21732086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33679.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 21732086 is about 4661.7685485232. The cubic root of 21732086 is about 279.0618517136.

Adding to 21732086 its reverse (68023712), we get a palindrome (89755798).

The spelling of 21732086 in words is "twenty-one million, seven hundred thirty-two thousand, eighty-six".