21230510 has 16 divisors (see below), whose sum is σ = 43674336. Its totient is φ = 7279008.

The previous prime is 21230509. The next prime is 21230533. The reversal of 21230510 is 1503212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151577 + ... + 151716.

It is an arithmetic number, because the mean of its divisors is an integer number (2729646).

Almost surely, 2^21230510 is an apocalyptic number.

21230510 is an abundant number, since it is smaller than the sum of its proper divisors (22443826).

21230510 is a wasteful number, since it uses less digits than its factorization.

21230510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303307.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 21230510 is about 4607.6577563877. The cubic root of 21230510 is about 276.8982061987.

Adding to 21230510 its reverse (1503212), we get a palindrome (22733722).

The spelling of 21230510 in words is "twenty-one million, two hundred thirty thousand, five hundred ten".