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21019193 = 131616861
BaseRepresentation
bin101000000101…
…1101000111001
31110112212220122
41100023220321
520340103233
62030303025
7343442306
oct120135071
943485818
1021019193
1110957038
127057a75
13447c2c0
151ca2d98
hex140ba39

21019193 has 4 divisors (see below), whose sum is σ = 22636068. Its totient is φ = 19402320.

The previous prime is 21019189. The next prime is 21019231. The reversal of 21019193 is 39191012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7856809 + 13162384 = 2803^2 + 3628^2 .

It is a cyclic number.

It is not a de Polignac number, because 21019193 - 22 = 21019189 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21019393) 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 3 ways as a sum of consecutive naturals, for example, 808418 + ... + 808443.

It is an arithmetic number, because the mean of its divisors is an integer number (5659017).

Almost surely, 221019193 is an apocalyptic number.

It is an amenable number.

21019193 is a deficient number, since it is larger than the sum of its proper divisors (1616875).

21019193 is a wasteful number, since it uses less digits than its factorization.

21019193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616874.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 21019193 is about 4584.6693446747. The cubic root of 21019193 is about 275.9764428889.

It can be divided in two parts, 21019 and 193, that added together give a palindrome (21212).

The spelling of 21019193 in words is "twenty-one million, nineteen thousand, one hundred ninety-three".

Divisors: 1 13 1616861 21019193