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21190085 = 573716363
BaseRepresentation
bin101000011010…
…1010111000101
31110212120022222
41100311113011
520411040320
62034102125
7345053450
oct120652705
943776288
1021190085
1110a63474
12711a945
13450c017
142b58497
151cd8825
hex14355c5

21190085 has 16 divisors (see below), whose sum is σ = 29847936. Its totient is φ = 14136768.

The previous prime is 21190079. The next prime is 21190093. The reversal of 21190085 is 58009112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21190085 - 214 = 21173701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6887 + ... + 9476.

It is an arithmetic number, because the mean of its divisors is an integer number (1865496).

Almost surely, 221190085 is an apocalyptic number.

It is an amenable number.

21190085 is a deficient number, since it is larger than the sum of its proper divisors (8657851).

21190085 is a wasteful number, since it uses less digits than its factorization.

21190085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16412.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 21190085 is about 4603.2689471722. The cubic root of 21190085 is about 276.7223473036.

Adding to 21190085 its reverse (58009112), we get a palindrome (79199197).

The spelling of 21190085 in words is "twenty-one million, one hundred ninety thousand, eighty-five".

Divisors: 1 5 7 35 37 185 259 1295 16363 81815 114541 572705 605431 3027155 4238017 21190085