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21040912 = 249911327
BaseRepresentation
bin101000001000…
…0111100010000
31110120222201001
41100100330100
520341302122
62030551344
7343562524
oct120207420
943528631
1021040912
1110971392
127068554
134489159
142b19d84
151ca9527
hex1410f10

21040912 has 20 divisors (see below), whose sum is σ = 40838656. Its totient is φ = 10501920.

The previous prime is 21040891. The next prime is 21040919. The reversal of 21040912 is 21904012.

It is a self number, because there is not a number n which added to its sum of digits gives 21040912.

It is not an unprimeable number, because it can be changed into a prime (21040919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15193 + ... + 16519.

Almost surely, 221040912 is an apocalyptic number.

It is an amenable number.

21040912 is a deficient number, since it is larger than the sum of its proper divisors (19797744).

21040912 is a wasteful number, since it uses less digits than its factorization.

21040912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2326 (or 2320 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 21040912 is about 4587.0373881188. The cubic root of 21040912 is about 276.0714650757.

Adding to 21040912 its reverse (21904012), we get a palindrome (42944924).

It can be divided in two parts, 21040 and 912, that added together give a cube (21952 = 283).

The spelling of 21040912 in words is "twenty-one million, forty thousand, nine hundred twelve".

Divisors: 1 2 4 8 16 991 1327 1982 2654 3964 5308 7928 10616 15856 21232 1315057 2630114 5260228 10520456 21040912