21423003 has 8 divisors (see below), whose sum is σ = 32644608. Its totient is φ = 12241704.

The previous prime is 21422993. The next prime is 21423007. The reversal of 21423003 is 30032412.

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

It is not a de Polignac number, because 21423003 - 2⁶ = 21422939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21423007) 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, 510051 + ... + 510092.

It is an arithmetic number, because the mean of its divisors is an integer number (4080576).

Almost surely, 2^21423003 is an apocalyptic number.

21423003 is a deficient number, since it is larger than the sum of its proper divisors (11221605).

21423003 is a wasteful number, since it uses less digits than its factorization.

21423003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1020153.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21423003 is about 4628.4990007561. The cubic root of 21423003 is about 277.7325507819.

Adding to 21423003 its reverse (30032412), we get a palindrome (51455415).

The spelling of 21423003 in words is "twenty-one million, four hundred twenty-three thousand, three".