21746085 has 16 divisors (see below), whose sum is σ = 35994240. Its totient is φ = 11197760.

The previous prime is 21746057. The next prime is 21746099. The reversal of 21746085 is 58064712.

It is not a de Polignac number, because 21746085 - 2⁷ = 21745957 is a prime.

It is a congruent number.

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, 24561 + ... + 25430.

It is an arithmetic number, because the mean of its divisors is an integer number (2249640).

Almost surely, 2^21746085 is an apocalyptic number.

It is an amenable number.

21746085 is a deficient number, since it is larger than the sum of its proper divisors (14248155).

21746085 is a wasteful number, since it uses less digits than its factorization.

21746085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50028.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 21746085 is about 4663.2697755974. The cubic root of 21746085 is about 279.1217592674.

The spelling of 21746085 in words is "twenty-one million, seven hundred forty-six thousand, eighty-five".