21415103 has 4 divisors (see below), whose sum is σ = 21546648. Its totient is φ = 21283560.

The previous prime is 21415099. The next prime is 21415129. The reversal of 21415103 is 30151412.

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 21415103 - 2² = 21415099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21415133) 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, 65528 + ... + 65853.

It is an arithmetic number, because the mean of its divisors is an integer number (5386662).

Almost surely, 2^21415103 is an apocalyptic number.

21415103 is a deficient number, since it is larger than the sum of its proper divisors (131545).

21415103 is a wasteful number, since it uses less digits than its factorization.

21415103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131544.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21415103 is about 4627.6455136495. The cubic root of 21415103 is about 277.6984074686.

Adding to 21415103 its reverse (30151412), we get a palindrome (51566515).

The spelling of 21415103 in words is "twenty-one million, four hundred fifteen thousand, one hundred three".