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21003103 = 111909373
BaseRepresentation
bin101000000011…
…1101101011111
31110112001211201
41100013231133
520334044403
62030100331
7343344352
oct120075537
943461751
1021003103
1110945a40
12704a6a7
134474b94
142b0a299
151c9d21d
hex1407b5f

21003103 has 4 divisors (see below), whose sum is σ = 22912488. Its totient is φ = 19093720.

The previous prime is 21003097. The next prime is 21003107. The reversal of 21003103 is 30130012.

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

It is a cyclic number.

It is not a de Polignac number, because 21003103 - 29 = 21002591 is a prime.

It is a super-2 number, since 2×210031032 = 882260671257218, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21003103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003107) 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, 954676 + ... + 954697.

It is an arithmetic number, because the mean of its divisors is an integer number (5728122).

Almost surely, 221003103 is an apocalyptic number.

21003103 is a deficient number, since it is larger than the sum of its proper divisors (1909385).

21003103 is a wasteful number, since it uses less digits than its factorization.

21003103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1909384.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 21003103 is about 4582.9142475067. The cubic root of 21003103 is about 275.9060057652.

Adding to 21003103 its reverse (30130012), we get a palindrome (51133115).

The spelling of 21003103 in words is "twenty-one million, three thousand, one hundred three".

Divisors: 1 11 1909373 21003103