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21138013 = 1321929227
BaseRepresentation
bin101000010100…
…0101001011101
31110202220220101
41100220221131
520402404023
62033021101
7344445601
oct120505135
943686811
1021138013
1110a28336
1270b4791
1344c1400
142b43501
151cc81ad
hex1428a5d

21138013 has 24 divisors (see below), whose sum is σ = 25034400. Its totient is φ = 17769024.

The previous prime is 21138011. The next prime is 21138017. The reversal of 21138013 is 31083112.

It is not a de Polignac number, because 21138013 - 21 = 21138011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21138011) 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 23 ways as a sum of consecutive naturals, for example, 93006 + ... + 93232.

It is an arithmetic number, because the mean of its divisors is an integer number (1043100).

Almost surely, 221138013 is an apocalyptic number.

It is an amenable number.

21138013 is a deficient number, since it is larger than the sum of its proper divisors (3896387).

21138013 is a wasteful number, since it uses less digits than its factorization.

21138013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 288 counting only the distinct ones).

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

The square root of 21138013 is about 4597.6094875489. The cubic root of 21138013 is about 276.4954911209.

The spelling of 21138013 in words is "twenty-one million, one hundred thirty-eight thousand, thirteen".

Divisors: 1 13 19 29 169 227 247 377 551 2951 3211 4313 4901 6583 7163 38363 56069 85579 93119 125077 728897 1112527 1626001 21138013