21532206 has 24 divisors (see below), whose sum is σ = 45454824. Its totient is φ = 6798960.

The previous prime is 21532201. The next prime is 21532219. The reversal of 21532206 is 60223512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2805 + ... + 7136.

It is an arithmetic number, because the mean of its divisors is an integer number (1893951).

Almost surely, 2^21532206 is an apocalyptic number.

21532206 is an abundant number, since it is smaller than the sum of its proper divisors (23922618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21532206 is a wasteful number, since it uses less digits than its factorization.

21532206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9984 (or 9965 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 21532206 is about 4640.2808104683. The cubic root of 21532206 is about 278.2036618135.

Adding to 21532206 its reverse (60223512), we get a palindrome (81755718).

The spelling of 21532206 in words is "twenty-one million, five hundred thirty-two thousand, two hundred six".