21046230 has 56 divisors (see below), whose sum is σ = 56818512. Its totient is φ = 5610384.

The previous prime is 21046217. The next prime is 21046231. The reversal of 21046230 is 3264012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21046231) 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 27 ways as a sum of consecutive naturals, for example, 5847 + ... + 8733.

Almost surely, 2^21046230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21046230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28409256).

21046230 is an abundant number, since it is smaller than the sum of its proper divisors (35772282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21046230 is an equidigital number, since it uses as much as digits as its factorization.

21046230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2912 (or 2897 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21046230 is about 4587.6170284800. The cubic root of 21046230 is about 276.0947217416.

The spelling of 21046230 in words is "twenty-one million, forty-six thousand, two hundred thirty".