21345103 has 4 divisors (see below), whose sum is σ = 22987048. Its totient is φ = 19703160.

The previous prime is 21345101. The next prime is 21345119. The reversal of 21345103 is 30154312.

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 21345103 - 2¹ = 21345101 is a prime.

It is a super-2 number, since 2×21345103² = 911226844161218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21345101) 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, 820953 + ... + 820978.

It is an arithmetic number, because the mean of its divisors is an integer number (5746762).

Almost surely, 2^21345103 is an apocalyptic number.

21345103 is a deficient number, since it is larger than the sum of its proper divisors (1641945).

21345103 is a wasteful number, since it uses less digits than its factorization.

21345103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641944.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21345103 is about 4620.0760816246. The cubic root of 21345103 is about 277.3955043077.

Adding to 21345103 its reverse (30154312), we get a palindrome (51499415).

The spelling of 21345103 in words is "twenty-one million, three hundred forty-five thousand, one hundred three".