21030093 has 24 divisors (see below), whose sum is σ = 36545600. Its totient is φ = 11384064.

The previous prime is 21030083. The next prime is 21030109. The reversal of 21030093 is 39003012.

It is not a de Polignac number, because 21030093 - 2⁸ = 21029837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7588 + ... + 9981.

Almost surely, 2^21030093 is an apocalyptic number.

It is an amenable number.

21030093 is a deficient number, since it is larger than the sum of its proper divisors (15515507).

21030093 is a wasteful number, since it uses less digits than its factorization.

21030093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17601 (or 17598 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 21030093 is about 4585.8579349997. The cubic root of 21030093 is about 276.0241393506.

It can be divided in two parts, 2103009 and 3, that added together give a palindrome (2103012).

The spelling of 21030093 in words is "twenty-one million, thirty thousand, ninety-three".