21487103 has 4 divisors (see below), whose sum is σ = 23440488. Its totient is φ = 19533720.

The previous prime is 21487093. The next prime is 21487111. The reversal of 21487103 is 30178412.

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 21487103 - 2⁴ = 21487087 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21487153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 976676 + ... + 976697.

It is an arithmetic number, because the mean of its divisors is an integer number (5860122).

Almost surely, 2^21487103 is an apocalyptic number.

21487103 is a deficient number, since it is larger than the sum of its proper divisors (1953385).

21487103 is a wasteful number, since it uses less digits than its factorization.

21487103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1953384.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 21487103 is about 4635.4183198499. The cubic root of 21487103 is about 278.0092771605.

The spelling of 21487103 in words is "twenty-one million, four hundred eighty-seven thousand, one hundred three".