21224903 has 8 divisors (see below), whose sum is σ = 24472608. Its totient is φ = 18031104.

The previous prime is 21224899. The next prime is 21224911. The reversal of 21224903 is 30942212.

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

It is not a de Polignac number, because 21224903 - 2² = 21224899 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 (21224923) 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, 12626 + ... + 14207.

It is an arithmetic number, because the mean of its divisors is an integer number (3059076).

Almost surely, 2^21224903 is an apocalyptic number.

21224903 is a deficient number, since it is larger than the sum of its proper divisors (3247705).

21224903 is a wasteful number, since it uses less digits than its factorization.

21224903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26953.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 21224903 is about 4607.0492725822. The cubic root of 21224903 is about 276.8738276833.

The spelling of 21224903 in words is "twenty-one million, two hundred twenty-four thousand, nine hundred three".