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21120711 = 356912373
BaseRepresentation
bin101000010010…
…0011011000111
31110202001011120
41100210123013
520401330321
62032405023
7344344263
oct120443307
943661146
1021120711
1110a16337
1270a6773
1344b6581
142b3b0a3
151cc2ec6
hex14246c7

21120711 has 8 divisors (see below), whose sum is σ = 28212720. Its totient is φ = 14054592.

The previous prime is 21120707. The next prime is 21120713. The reversal of 21120711 is 11702112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21120711 - 22 = 21120707 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120713) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4480 + ... + 7893.

It is an arithmetic number, because the mean of its divisors is an integer number (3526590).

Almost surely, 221120711 is an apocalyptic number.

21120711 is a deficient number, since it is larger than the sum of its proper divisors (7092009).

21120711 is a wasteful number, since it uses less digits than its factorization.

21120711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12945.

The product of its (nonzero) digits is 28, while the sum is 15.

The square root of 21120711 is about 4595.7274723378. The cubic root of 21120711 is about 276.4200310033.

Adding to 21120711 its reverse (11702112), we get a palindrome (32822823).

It can be divided in two parts, 2 and 1120711, that multiplied together give a palindrome (2241422).

The spelling of 21120711 in words is "twenty-one million, one hundred twenty thousand, seven hundred eleven".

Divisors: 1 3 569 1707 12373 37119 7040237 21120711