21230506 has 8 divisors (see below), whose sum is σ = 34740864. Its totient is φ = 9650220.

The previous prime is 21230483. The next prime is 21230509. The reversal of 21230506 is 60503212.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21230509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 482490 + ... + 482533.

It is an arithmetic number, because the mean of its divisors is an integer number (4342608).

Almost surely, 2^21230506 is an apocalyptic number.

21230506 is a deficient number, since it is larger than the sum of its proper divisors (13510358).

21230506 is a wasteful number, since it uses less digits than its factorization.

21230506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965036.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21230506 is about 4607.6573223277. The cubic root of 21230506 is about 276.8981888087.

Adding to 21230506 its reverse (60503212), we get a palindrome (81733718).

It can be divided in two parts, 21230 and 506, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 21230506 in words is "twenty-one million, two hundred thirty thousand, five hundred six".