21354230 has 32 divisors (see below), whose sum is σ = 40116384. Its totient is φ = 8176896.

The previous prime is 21354197. The next prime is 21354241. The reversal of 21354230 is 3245312.

It is a happy number.

21354230 is a Rhonda number in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22322 + ... + 23258.

It is an arithmetic number, because the mean of its divisors is an integer number (1253637).

Almost surely, 2^21354230 is an apocalyptic number.

21354230 is a deficient number, since it is larger than the sum of its proper divisors (18762154).

21354230 is a wasteful number, since it uses less digits than its factorization.

21354230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 21354230 is about 4621.0637303547. The cubic root of 21354230 is about 277.4350360603.

Adding to 21354230 its reverse (3245312), we get a palindrome (24599542).

The spelling of 21354230 in words is "twenty-one million, three hundred fifty-four thousand, two hundred thirty".