21320230 has 8 divisors (see below), whose sum is σ = 38376432. Its totient is φ = 8528088.

The previous prime is 21320213. The next prime is 21320239. The reversal of 21320230 is 3202312.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21320230.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320239) 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, 1066002 + ... + 1066021.

It is an arithmetic number, because the mean of its divisors is an integer number (4797054).

Almost surely, 2^21320230 is an apocalyptic number.

21320230 is a deficient number, since it is larger than the sum of its proper divisors (17056202).

21320230 is a wasteful number, since it uses less digits than its factorization.

21320230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132030.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21320230 is about 4617.3834581936. The cubic root of 21320230 is about 277.2877147111.

Adding to 21320230 its reverse (3202312), we get a palindrome (24522542).

The spelling of 21320230 in words is "twenty-one million, three hundred twenty thousand, two hundred thirty".