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21210676 = 226186929
BaseRepresentation
bin101000011101…
…0011000110100
31110220121120121
41100322120310
520412220201
62034341324
7345200464
oct120723064
943817517
1021210676
1110a77993
12712a844
1345184c6
142b61ba4
151cde9a1
hex143a634

21210676 has 12 divisors (see below), whose sum is σ = 37727620. Its totient is φ = 10431360.

The previous prime is 21210649. The next prime is 21210691. The reversal of 21210676 is 67601212.

It can be written as a sum of positive squares in 2 ways, for example, as 2496400 + 18714276 = 1580^2 + 4326^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21210676.

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 3 ways as a sum of consecutive naturals, for example, 43221 + ... + 43708.

Almost surely, 221210676 is an apocalyptic number.

It is an amenable number.

21210676 is a deficient number, since it is larger than the sum of its proper divisors (16516944).

21210676 is a wasteful number, since it uses less digits than its factorization.

21210676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86994 (or 86992 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 21210676 is about 4605.5049668847. The cubic root of 21210676 is about 276.8119512420.

Adding to 21210676 its reverse (67601212), we get a palindrome (88811888).

The spelling of 21210676 in words is "twenty-one million, two hundred ten thousand, six hundred seventy-six".

Divisors: 1 2 4 61 122 244 86929 173858 347716 5302669 10605338 21210676