21450230 has 8 divisors (see below), whose sum is σ = 38610432. Its totient is φ = 8580088.

The previous prime is 21450229. The next prime is 21450239. The reversal of 21450230 is 3205412.

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

It is a super-2 number, since 2×21450230² = 920224734105800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21450199 and 21450208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450239) 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, 1072502 + ... + 1072521.

It is an arithmetic number, because the mean of its divisors is an integer number (4826304).

Almost surely, 2^21450230 is an apocalyptic number.

21450230 is a deficient number, since it is larger than the sum of its proper divisors (17160202).

21450230 is a wasteful number, since it uses less digits than its factorization.

21450230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2145030.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21450230 is about 4631.4393011244. The cubic root of 21450230 is about 277.8501599225.

Adding to 21450230 its reverse (3205412), we get a palindrome (24655642).

The spelling of 21450230 in words is "twenty-one million, four hundred fifty thousand, two hundred thirty".