21450003 has 8 divisors (see below), whose sum is σ = 28790016. Its totient is φ = 14205000.

The previous prime is 21449959. The next prime is 21450019. The reversal of 21450003 is 30005412.

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

It is not a de Polignac number, because 21450003 - 2²⁰ = 20401427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21450083) 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, 23223 + ... + 24128.

It is an arithmetic number, because the mean of its divisors is an integer number (3598752).

Almost surely, 2^21450003 is an apocalyptic number.

21450003 is a deficient number, since it is larger than the sum of its proper divisors (7340013).

21450003 is a wasteful number, since it uses less digits than its factorization.

21450003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47505.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 21450003 is about 4631.4147946389. The cubic root of 21450003 is about 277.8491797899.

Adding to 21450003 its reverse (30005412), we get a palindrome (51455415).

The spelling of 21450003 in words is "twenty-one million, four hundred fifty thousand, three".