21124903 has 8 divisors (see below), whose sum is σ = 22446720. Its totient is φ = 19824120.

The previous prime is 21124877. The next prime is 21124927. The reversal of 21124903 is 30942112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21124903 - 2⁵ = 21124871 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 (21124973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3163 + ... + 7228.

It is an arithmetic number, because the mean of its divisors is an integer number (2805840).

Almost surely, 2^21124903 is an apocalyptic number.

21124903 is a deficient number, since it is larger than the sum of its proper divisors (1321817).

21124903 is a wasteful number, since it uses less digits than its factorization.

21124903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10517.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 21124903 is about 4596.1835254916. The cubic root of 21124903 is about 276.4383175739.

The spelling of 21124903 in words is "twenty-one million, one hundred twenty-four thousand, nine hundred three".