21545086 has 16 divisors (see below), whose sum is σ = 35400240. Its totient is φ = 9788800.

The previous prime is 21545077. The next prime is 21545141. The reversal of 21545086 is 68054512.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9940 + ... + 11911.

It is an arithmetic number, because the mean of its divisors is an integer number (2212515).

Almost surely, 2^21545086 is an apocalyptic number.

21545086 is a deficient number, since it is larger than the sum of its proper divisors (13855154).

21545086 is a wasteful number, since it uses less digits than its factorization.

21545086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21899.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 21545086 is about 4641.6684500296. The cubic root of 21545086 is about 278.2591221308.

Adding to 21545086 its reverse (68054512), we get a palindrome (89599598).

The spelling of 21545086 in words is "twenty-one million, five hundred forty-five thousand, eighty-six".