21060985 has 16 divisors (see below), whose sum is σ = 28771200. Its totient is φ = 14650240.

The previous prime is 21060967. The next prime is 21061009. The reversal of 21060985 is 58906012.

It is not a de Polignac number, because 21060985 - 2⁵ = 21060953 is a prime.

It is an unprimeable number.

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, 7060 + ... + 9589.

It is an arithmetic number, because the mean of its divisors is an integer number (1798200).

Almost surely, 2^21060985 is an apocalyptic number.

It is an amenable number.

21060985 is a deficient number, since it is larger than the sum of its proper divisors (7710215).

21060985 is a wasteful number, since it uses less digits than its factorization.

21060985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16688.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 21060985 is about 4589.2248800860. The cubic root of 21060985 is about 276.1592277676.

Adding to 21060985 its reverse (58906012), we get a palindrome (79966997).

The spelling of 21060985 in words is "twenty-one million, sixty thousand, nine hundred eighty-five".