21054003 has 8 divisors (see below), whose sum is σ = 28456848. Its totient is φ = 13843584.

The previous prime is 21053987. The next prime is 21054017. The reversal of 21054003 is 30045012.

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

It is not a de Polignac number, because 21054003 - 2⁴ = 21053987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21054403) 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, 47850 + ... + 48287.

It is an arithmetic number, because the mean of its divisors is an integer number (3557106).

Almost surely, 2^21054003 is an apocalyptic number.

21054003 is a deficient number, since it is larger than the sum of its proper divisors (7402845).

21054003 is an equidigital number, since it uses as much as digits as its factorization.

21054003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96213.

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

The square root of 21054003 is about 4588.4641221219. The cubic root of 21054003 is about 276.1287075611.

Adding to 21054003 its reverse (30045012), we get a palindrome (51099015).

The spelling of 21054003 in words is "twenty-one million, fifty-four thousand, three".